Chapter 211 In one colony of beagles the incidence of pyometra was 15.2% of bitches older than 4 years of age, with the average age of onset 9.36 ± 0.35 years (Fukuda, 2001). In a population of insured dogs in Sweden in which routine ovariohysterectomy is disallowed, the crude 12-month incidence of pyometra over the 2-year period from 1995 through 1996 was approximately 2% in bitches under 10 years of age (Egenvall et al, 2001). A recent publication involving Swedish bitches lists the incidence of pyometra of bitches under 10 years of age at 25% (Hagman et al, 2011).
Pyometra
Pathogenesis
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