Terminology, behavioral pathology, and the Pageat (French) approach to canine behavior disorders

Chapter 22 Terminology, behavioral pathology, and the Pageat (French) approach to canine behavior disorders




Introduction


The definition and classification of behavior problems are among the main unsolved issues in the field of veterinary behavioral medicine. From a practical perspective, the availability of a well-defined terminology and classification system has three benefits. First, it allows for better communication between practitioners and behaviorists. Second, it helps to compare the outcomes of different research projects. Finally, it provides general practitioners and students with more accessible and ready-to-use protocols of intervention. Nevertheless, the construction of a structured diagnostic system for behavior problems faces many methodological and conceptual difficulties.


Classification is a process by which complexity is organized into a list of discrete and well-defined categories according to pre-established clinical signs. Clinical signs and symptoms could be defined as the simplest description of a particular aspect of the animal’s behavior or physiology. In behavioral medicine, clinical signs come from three different sources: (1) owner’s descriptions; (2) clinician’s direct observation of the behavior (i.e., either in person or by electronic recording); and (3) results from the medical examination, including blood workup and other diagnostics. Standardizing the extraction of information is a burning topic in the field of veterinary behavioral medicine. Compared to human psychiatry, there are still very few diagnostic tools, like scales and questionnaires, which have been fully tested for reliability and validity.


Syndromes are clusters of clinical signs that statistically occur together. One example could be anxiety and its associated physical and behavioral signs. Even though some basic behavior patterns are consistently observed from one case to another, the behavior of animals is by definition extremely rich and variable as a result of the interaction of the many factors that influence its expression. Two animals may fit within the same category for one particular dimension of behavior but still show a very different profile in terms of other dimensions of behavior and temperament traits.


Another fundamental discussion regarding the idea of classification and diagnosis is related to the interpretation of behavior problems as normal adaptive responses, or alternatively as dysfunctional conditions. Defining the boundaries between normal and abnormal behavior is a very difficult and controversial topic not only in veterinary behavioral medicine but also in human psychiatry. Language is a very important matter so that using terms like clinical signs, symptoms, syndromes, or diagnoses could indirectly lead to the assumption that we are in fact dealing with pure pathological conditions. For all these reasons, many authors support a more open and flexible way of categorizing behavior problems which takes into account the natural variability of behavior and the fact that a behavior problem may or may not be related to an underlying dysfunctional state.1


A good example of the aforementioned elements of discussion is a group of problem behaviors in dogs that can be broadly termed as aggression toward family members. A review of the literature on this subject demonstrates that each author may use particular classifications and terminology.2 In some cases, differences are just related to the words used to describe more or less the same conditions, whereas in others, deeper discrepancies are found regarding the biological interpretation of this behavior problem. Indeed, owner-directed aggression has been linked to different underlying causes, from a hierarchical conflict between the dog and its owners to simply an active avoidance reaction in contexts of conflict. Further, for some authors these forms of aggression are mostly considered an expression of normal behavior, whereas for others, they are often linked to a pathological state.


Another example of the difficulties in classifying behavior problems comes from a very interesting experience organized during the 5th International Veterinary Behavior Meeting (Minneapolis, 2005). An international group of experts was asked to characterize a dog showing a problem of self-mutilation of the carpal area. The problem appeared only during the owner’s absence. The clinical case was termed by different participants as a stereotypic behavior, a compulsive disorder, and a separation anxiety with mutilation as a main clinical sign.


Some years ago a comprehensive system for the classification of behavior disorders in dogs was developed by French colleagues based on the analysis of more than 11 000 clinical cases. This approach partially follows the philosophy of the Diagnostic and Statistical Manual of Mental Disorders (DSM)3 system for the diagnosis of mental disorders in human beings, which itself is in draft for a fifth version (DSM-5) at the time of writing. Basically a list of well-defined and discrete categories of behavioral disorders is offered based on the observation of specific clusters of signs and symptoms. Each diagnostic category is considered the result of an underlying dysfunctional state (see glossary, Table 22.1). This assumption is reflected in the terminology used (i.e., sociopathy, hypersensitivity–hyperactivity (HS–HA) syndrome, Cocker spaniel dysthymia) as well as in the fact that psychotropic drugs are included in the treatment for the vast majority of disorders. Similarly to the DSM system, disorders are clustered in sections according to the patient’s age. One patient can show more than one of these conditions together. In addition to classifying behavior problems, the Pageat or French approach presents an alternative pharmacopoeia in terms of recommended drugs, as well as doses and indications.


Table 22.1 Glossary of terms used in the Pageat (French) approach

































Bulimia Conditions of increased food intake due to an emotional disorder. Pageat links bulimia to states of either permanent anxiety or chronic depression
Deficitary sign Any clinical sign that represents a decrease in social interactions, communication and motivation
Depressive state A reactive state characterized by a diminished receptivity to stimuli and a spontaneously irreversible inhibition
Dysthymia A state characterized by sudden fluctuations of mood, impulsiveness, stereotypies, a lack of social inhibition, sleep disorders, and feeding disorders
Encopresis Defecation in the resting location during a period of rest
Enuresis Urination in the resting location during a period of rest
Normothymics Mood stabilizers
Potomania Psychogenic polydipsia
Productive sign Any clinical sign that appears or increases its normal frequency or intensity
Antiproductive sign Any clinical sign that decreases its normal frequency or intensity

All of the following terms, diagnoses, and treatments are attributed to Dr. Patrick Pageat and are included here for completeness and for the exposure of our readers to alternative approaches to behavioral conditions. The authors would like to thank Dr. Pageat for allowing his work to be reproduced in this book. In general, neuroleptics are more often recommended and doses and indications of commonly prescribed drugs might also be different. Clinicians must use their own judgment regarding applicability of this information to their clients and patients.




Scales


Clinical ethology consultations should be viewed as having the same objectives as consultations conducted within all other clinical medical fields. They are concerned with recognizing signs that will help us to categorize the different clinical conditions, regardless of whether they are considered pathological or just an expression of normal behavior. The only specificity of our discipline lies in putting value upon the interview with the animal’s owners with a view to establishing the diagnosis. This interview process is the point at which inexperienced clinicians frequently encounter problems, since owners have an unfortunate tendency to give redundant, unreliable, and even unbelievable histories. In addition, since the owners are not usually well versed in ethology, they give information that has been subjected to cultural or emotional interpretation. In order to simplify the task for novice clinicians, a number of scales have been developed for data collection and assessment. In addition, the most significant presenting signs for each condition will be discussed.


In the interview, there is a degree of unearthing a certain amount of emotional motivation and impulse. The behavior consultation can thus be considered as the first step in developing a treatment program, since it will help to understand the functional perspective of the pet’s behavior within its own species, and within the family structure as the animal perceives it. This act of playing down the emotional and anthropomorphic aspects of the history, along with a clear explanation of the facts, is essential to the therapeutic contract to be agreed upon with the family. This ensures their commitment and cooperation. The consultation is carried out in several stages, but the order may differ from what is discussed below. For example, the physical examination may either follow or precede the consultation process, and some stages may occur simultaneously.


It is both reassuring and useful for clinicians to have objective clinical tools to help them confirm their patient’s state. On the other hand, these evaluation systems do not replace a close attention to clinical signs. Their role is to help us identify the stage of development, assess the progression of the behavior problem, and thus objectively assess the effect of the treatment.


Currently, three scales are utilized that have been partially validated in terms of reliability and sensitivity. The scale for assessment of old dogs, known as the Age-Related Cognitive and Affective Disorders (ARCAD) scale, is discussed in Chapter 13.



Scale for evaluation of aggressiveness


For clinicians, assessing aggressive dogs constitutes a serious problem due to the complexity of a patient’s clinical picture as well as the ethical and legal consequences of any errors in evaluation. This scale classifies aggression into three types of sequential organization. It measures the intensity with two types of measurement: a global aggressiveness index (Iag) and a social aggressiveness index (Ias), as well as the ratio of the two (Ias/Iag) × 100 (expressed as a percentage). Three types of sequential organization are possible: type 1, growls; type 2, growls and attempts to bite; type 3, direct bite (without warning).


The global aggressiveness index and social aggressiveness index are calculated from the scores obtained in Form 22.1 using the following eight parameters:




The higher the score, the less favorable the prognosis. Thus, the fact that a dog has displayed aggression, followed by a new threatening phase, is more unfavorable than withdrawing rapidly to hide, which leads to a score of 5 for the former and 1 for the latter. Each parameter should be determined by questioning the owners rather than allowing them to read the grid, to reduce the possibility of distorting the answers. People who are offered a questionnaire often tend to try to improve their image to the “pollster” or create empathy by supplying answers they think the clinician wants to hear.


The Iag global aggressiveness index evaluates the intensity and frequency of all of a dog’s aggressive behavior within a social group (e.g., pack, family) and its interactions with a given person. A measurement will therefore have to be carried out for each member of a group. Approximations of the group may lead to underevaluation of the seriousness of the problem and distort the initial evaluation as well as the patient’s monitoring. The global index is calculated thus:



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The Ias social aggressivity index helps evaluate the intensity and frequency of aggressive behavior that is connected with maintaining hierarchical rank or the acquisition of a higher status. It is calculated thus:



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Finally, the ratio (Ias/Iag) × 100 provides an estimate of the role of social phenomena in the genesis of aggressive manifestations. For each age and sex group, it is possible to give “normal” value ranges, i.e., corresponding to the values obtained from animals not displaying any affective behavioral symptoms and not living in a hierarchically unbalanced group.


It is also possible to compare the values obtained for a given patient with the norms of its age and sex group (Table 22.2). These measurements help to simplify differential diagnoses of behavioral changes associated with an aggressive case:




This scale was published by Pageat in his text4 using 270 control dogs and 132 dogs suffering from behavioral disorders (Table 22.2).



Scale for evaluation of emotional and cognitive disorders (EDED scale)


This scale’s objective is to measure emotional disruptions in all age groups. It is constructed using simple behavioral parameters that are modified by affective disorders. These parameters were selected following factorial analysis of the history associated with each type of complaint. The scale was then validated by Pageat with a population of 190 controls and 215 dogs suffering from affective disorders. The result is an approach in four parts:



The presence of a behavior in the grid does not mean that it has to be pathological, but only that it is statistically associated with clinical pictures of emotional disorders. With each category, some selected types of behavior are taken into account and the different configurations that they may take are assigned an arbitrary numerical score between 1 and 5. The highest score is given to the poorest prognosis. The final mark, called the EDED value, is the result of adding all the scores together (Form 22.2 and Table 22.3).



Table 22.3 Interpretation grid of EDED scores


















EDED value Interpretation
9–12 Normal state
13–16 Phobias
17–35 Anxieties
36–44 Emotional (thymic) disorders

Once clinicians have obtained this score, they can evaluate it using the interpretation grid (Table 22.3). As with the aggressiveness indices, the EDED score does not replace the clinical approach; it complements it, facilitates the differential diagnosis, and helps objectively evaluate the animal’s progress during treatment. As with the other forms, the evaluator and not the owner should complete the form.



The ARCAD scale


The calculation grid of the ARCAD score was constructed according to the same rules as EDED (see Chapter 13). While the parameters that make up both scales are very similar, they can have different diagnostic meanings. Therefore, while the EDED scale helps evaluate dogs of all ages, the ARCAD measurement provides a better means of assessing problems that might be specific to the older dog. For example, old dogs can obtain an EDED score of the anxious type, while their ARCAD score suggests a temperament disorder. The EDED scale is not designed to assess mood disorders (see Chapter 13), which have a more discrete symptomatology in old dogs. Moreover, the ARCAD scale helps discriminate affective disorders (emotional score) from cognitive disorders to determine if drugs such as selegiline might be indicated.



Specific therapies


In the field of veterinary behavioral medicine, most behavior modification techniques are aimed at improving the dog’s reaction when exposed to stimuli triggering a problem behavior. These techniques are mainly based on learning principles and include desensitization and counterconditioning.


In addition to these techniques, which are described elsewhere in the book, a set of qualitatively different techniques is usually implemented by behaviorists following this alternative approach. The discussion of all these therapeutic options is beyond the scope of this book. Nevertheless, a brief description of some is now presented for a better understanding of the treatment protocols outlined below.





Disorders appearing during puppyhood or adolescence



Sensory homeostatic disorders


In this category, we shall group both clinical pictures dominated by a hyperreactivity concerning one or several sensory systems associated with a lack of control of motor responses, and affective disorders ranging from phobia to depression. This highlights how both hyperproductive and deficiency states may be observed in these cases. Passing from one clinical form to another is often the rule. This is why we will focus on those problems that are most often the source of diagnostic difficulty.



Hypersensitivity–hyperactivity syndrome





Differential diagnosis


It is necessary to distinguish between this syndrome and stage 1 deprivation syndrome, primary dyssocialization, and sociopathy.


Although the tendency to react excessively to stimuli may be common to HS–HA and deprivation syndrome, dogs with deprivation syndrome display behavioral responses of fear aggression or inhibited responses associated with displacement activities. In addition, dogs with deprivation syndrome acquire an inhibited bite and have normal mobility. These latter considerations must be taken into account to help differentiate deprivation anxiety from dogs with a HS–HA syndrome and concurrent anxiety.


Differential diagnosis is based on two essential points that are characteristic of primary dyssocialization: the absence of an alteration in the total length of sleep and the existence of irritable and hierarchical aggression without the expression of a submissive posture. The bites inflicted by the pup on its owners are often the reason that the client seeks help, so it is necessary to assess all of the signs. During HS–HA syndrome, bites inflicted by puppies do not conform to a typical aggression sequence.


This is very different from what is seen in reactive-stage sociopathies, which are characterized by perfectly regulated aggressive sequences in response to specific triggers. The differential diagnosis with a sociopathy with secondary hyperactivity may be more difficult when the HS–HA has developed secondary hyperaggressiveness. It is possible to distinguish between the two by reviewing the development of the disorders, and by highlighting the existence of alterations in behavioral sequences in HS–HA.



Prognosis


This depends on the stage of development and the duration of the clinical picture. It is especially the age at which treatment is started that seems to determine the establishment of self-control. An analysis of therapeutic results from 120 dogs, as published in Pageat’s text,4 relates to the juvenile period, but no particular age within this period. Conversely, subjects treated after the start of sexual activity respond less well to treatment, and good control of dietary behavior (dog continues to steal food) and activity level are rarely obtained. Stage 2 shows a greater resistance to treatment. Usually, dietary and sleep disorders require drug therapy for almost a whole year. Whatever the age when treatment is started, it seems necessary to warn owners of the handicap this illness constitutes for the learning of complex tasks (hunting, search and rescue, drugs and explosives detection, guide dog, hearing dog for the deaf, or dog for the disabled). An early diagnosis must therefore be encouraged to help owners have realistic expectations about the dog’s potential abilities and limitations. In all cases, it is essential to warn the owners of the long duration of the treatment (5–9 months).



Treatment


This is based on the administration of psychotropic drugs aimed at controlling the overactivity and the establishment of a higher sensory homeostatic threshold. In addition, play therapy may help to stabilize all the animal’s reactions. During drug therapy, different groups of psychotropic drugs may be used according to the clinical picture. Currently, selegiline is the reference treatment for this condition. Its dosage is 0.5 mg/kg taken in a single morning dose. In some stage 2 cases, establishing normal satiety and sleep duration requires the use of fluoxetine 1–2 mg/kg in one morning dose.5 Unfortunately, the improvement may disappear very quickly after the drug is discontinued. Therapy combines elements of play therapy and learning social inhibitions in techniques derived from direct social regression. We insist that play sessions are carried out with a lot of care and rigor. The main pitfall is that if the dog jumps when it has reached maximal excitement during play, it may mouth or bite its owner. In order to avoid these reactions, owners are advised to stop play as soon as the dog produces acts which are not strictly connected with the play offered (e.g., during ball play, very quick short running phases around the play area while the ball trajectory is straight). Moreover, when the dog starts to jump around its owners, they should avoid all interaction, including waving their arms, which unfortunately is the spontaneous reaction of many people when a dog jumps on them.



Sensory deprivation syndrome



Description


Dogs suffering from deprivation syndrome have three possible clinical presentations, which correspond to very different deficiency levels and show an increasing level of severity. During stage 1 sensory deprivation syndrome (ontogenic phobias), dogs are presented for consultation because of their incapacity to withstand exposure to one or more types of stimuli. The most common stimuli are cars, urban noises, crowds, children, and persons with walking sticks or crutches. When exposed to these stimuli, the animals display typical fearful responses: flight, hiding, irritability, and aggression. Anticipation and generalization phenomena appear so the number of triggering stimuli may increase and the problem may progress to a more serious clinical stage or to other pathologies (secondary hyperaggressiveness). A primary complaint might be housesoiling if the dog refuses to go outside or stays outside for a time which is too short for it to do its business. This is the clinical picture of a phobia and not an anxious state, as believed a few years ago. The term “deprivation anxiety” is therefore not suitable for stage 1, but for stage 2. During stage 2 sensory deprivation (deprivation anxiety), the clinical picture quickly becomes dominated by inhibition signs and substitution activities. In the chronic state, activities may be permanently altered.


Exploratory behavior is deficient, with almost pathognomonic postural signs such as static exploration (feet together, neck stretched, ears bent backward, and tail between the hind legs) or an expectation posture at the start of many activities. Feeding behavior is also modified. It may be inhibited in the presence of, or following exposure to, new or unfamiliar stimuli. In a chronic case, nighttime eating periods are short and ingestion is quick (sometimes followed by regurgitation and reingestion), and the dog lies with belly up, tail between the thighs, and lowered ears. In fact, more than 75% of the dog’s daily ration may be consumed at night. The other notable fact is the rigidity of behavior of these animals. They always follow the same route inside and outside the house and they always come for their food at the same time. Any change in their routine may provoke withdrawal or panic attacks. Similarly, any change in the environment (i.e., a new piece of furniture or a new object in the dog’s normal route) may trigger an expectation posture usually followed by an attempt to flee or a trembling attack associated with immobility, sometimes combined with somatosensory signs. Self-injurious behavior of the limbs, flank, or tail, which is produced as a result of these traumatic situations, is frequently the reason for consultation. These animals are especially observed in deprivation anxieties associated with a state of hyperattachment. Other displacement activities are sometimes observed, the most frequent being polydipsia, whereas bulimia is extremely rare. Potomania was encountered in 5 out of 230 cases. Water consumption may reach more than 10 L/day, with a very active search for water. Potomania may lead to housesoiling since, as in stage 1, the dog may refuse to defecate and urinate outside the house.


Stage 3 sensory deprivation (depressed state) is largely dominated by the disappearance of exploratory behavior and play. Thus, this state is particularly easy to identify in a pup. Most often, the pup is lying down but does not sleep. It remains prostrate in a corner and only goes out at night. Eating happens exclusively at night. Elimination behavior is poorly controlled and may be observed in the area near to the normal sleeping place, or the dog may even exhibit encopresis and enuresis (elimination in the sleeping area). These clinical signs, although not pathognomonic (also found in attachment depression), are typical of a young age-onset depression, which will have the best prognosis if the clinician intervenes early. Very quickly (4–10 weeks), sleep disorders complicate the clinical picture. Micturition is generally associated with these awakenings. Progressively, the pup displays excitement and worrying periods (anxiety) just prior to nighttime sleep. It gets up, whines, scratches the walls, and looks for dark corners before falling asleep. Awakening occurs sooner and sooner and is repeated several times every night, thus decreasing the total duration of sleep.

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Jul 24, 2016 | Posted by in SMALL ANIMAL | Comments Off on Terminology, behavioral pathology, and the Pageat (French) approach to canine behavior disorders

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