Dog bites to the hand can look deceptively minor. Teeth create puncture, crush, and tearing forces that can drive bacteria deep and injure tendons, joints, vessels, and digital nerves. In urgent care and emergency settings, the priorities are straightforward:

1. Identify infection risk and deep-space involvement
2. Detect tendon, joint, vascular, and nerve injury
3. Decide who needs urgent hand surgery consultation and possible exploration

Patients often focus on pain and bleeding. The finding that changes the plan is numbness. Early counseling matters because persistent sensory loss can reflect dog bite nerve damage, and delayed evaluation can complicate both recovery and documentation.

Brief Anatomy Refresher

Each finger has two proper digital nerves running along the volar lateral sides toward the pulp. They travel beside the digital arteries and close to the flexor tendon sheath, particularly through the proximal and middle phalanx.

Practically, a bite on the volar pad or along either side of a finger can injure nerve, artery, and tendon in a single event. Bites near the MCP joint raise concern for the joint capsule and extensor mechanism, especially if the wound gapes with motion.

Mechanism and Risk Patterns

Mechanism helps predict depth. A quick snap can puncture and inoculate. A prolonged, shaking bite can avulse tissue and transect structures. Location matters too. Volar and lateral finger wounds sit near the neurovascular bundle. Web space bites can track into deeper planes.

A useful exam habit is to inspect the hand in the position the patient was bitten. Finger flexion and extension alter the position of a puncture relative to deeper structures. A wound that seems slightly off to the side in extension may line up with the neurovascular bundle in flexion.

History That Changes Management

Keep it practical:

• Time since the bite and any prior irrigation or closure
• Dog vaccination status, if known, plus rabies considerations per local guidance
• Dominant hand, job tasks, tool use, sports, instrument playing
• Diabetes, immunosuppression, anticoagulation, baseline neuropathy
• Nerve symptoms: numbness in a defined strip, tingling, “dead” fingertip, cold sensitivity
• Deeper injury clues: weakness, loss of pinch, pain with motion, clicking, or a finger held in flexion because extension hurts

Physical Examination

A careful preanesthetic neurovascular exam, documented with objective sensory testing, is the cornerstone of decision-making.

Examine Before Anesthesia

A local anesthetic can erase your most important finding. Start with:

• Inspection: puncture pattern, gaping laceration, contamination, swelling, erythema, visible fat or tendon
• Vascular: capillary refill, color, temperature; Doppler if concerned
• Motion: active flexion and extension, cascade, and rotation

Sensory Testing and Documentation

A careful sensory exam is the best screen for digital nerve injury.

• Light touch and pinprick: compare to the same digit on the other hand.
• Two-point discrimination (2PD): test the fingertip pulp in the suspected distribution and document the value in millimeters, plus the contralateral comparison.
• Map the deficit: write what is absent and where.

Dense numbness that fits a single digital nerve distribution after a lacerating bite should be treated as a likely nerve injury until proven otherwise.

Tendon and Joint Screen

Digital nerve injury often accompanies tendon or joint involvement.

• Flexors: isolate FDP (DIP flexion) and FDS (PIP flexion with other fingers held extended).
• Extensors: check full extension against resistance.
• Joint concern: deep joint-line tenderness, pain with passive motion, or a wound that appears to enter a joint.
• Infection concern: fusiform swelling, pain with passive extension, and tenderness along the flexor sheath suggest flexor tenosynovitis.

Red Flags for Urgent Hand Surgery Consultation

• Dense sensory loss in a specific digital nerve distribution
• Markedly abnormal 2PD compared with the opposite side
• Gaping wound with deep structure exposure
• Suspected tendon laceration or joint penetration
• Vascular compromise, rapidly progressive swelling, or severe pain out of proportion

Imaging and Adjuncts

Plain radiographs are low-cost and frequently helpful when you suspect a fracture, joint involvement, or a retained foreign body such as a tooth fragment. Ultrasound can sometimes help identify tendon disruption or foreign material, but it should not slow down consultation when neurologic findings are clear.

Electrodiagnostic testing rarely helps acutely in evaluating digital nerve injuries. Early decisions should be driven by history, exam, and wound features.

Initial Management While Deciding on Exploration

Treat the wound first.

• Irrigation: copious, high-volume irrigation to reduce surface contamination.
• Debridement: remove clearly devitalized tissue, preserve viable skin bridges, and avoid aggressive trimming that limits later options.
• Tetanus: update per immunization status.
• Immobilization: bulky dressing and splint to protect injured structures and reduce pain.
• Closure: many hand bite wounds are best left open or loosely approximated, particularly punctures and contaminated lacerations.

Antibiotics and Infection Risk

Hand bites are often treated with prophylactic antibiotics because infection can spread quickly along tendon sheaths and fascial planes. For infected bite wounds, many clinicians follow the IDSA guideline, aiming for aerobic and anaerobic coverage (with alternatives for allergy situations).

Arrange reassessment within 24 to 48 hours when swelling, pain, or erythema is notable, or when follow-up reliability is uncertain.

When to Explore

Exploration decisions depend on the likelihood of structural injury and the condition of the wound bed.

Consider early exploration or operative evaluation when:

• The exam shows a clear sensory deficit consistent with digital nerve transection
• There is associated tendon injury or vascular compromise
• The laceration is large, gaping, or clearly deep
• There is joint penetration or high suspicion of deep space involvement

Crush and contaminated wounds complicate planning for nerve repair. A traumatized bed raises infection risk and scarring, which can undermine a repair. In selected cases, debridement and stabilization come first, with definitive nerve work staged after soft-tissue improvement. Referral and planning should still happen early.

For operative principles and what a tension-free repair aims to achieve, see our guidance on digital nerve repair.

Pearls and Pitfalls

Pearls: test sensation before anesthesia, document objective values, map deficits, and recheck when swelling obscures the picture.
Pitfalls: tight closure of contaminated punctures, dismissing dense numbness as swelling without objective testing, and skipping a focused tendon and joint exam.

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