Dog Bite Management
All dog bite wounds should be thoroughly irrigated with copious amounts of normal saline or warm water, and preemptive antibiotic therapy with amoxicillin-clavulanate should be initiated for 3-5 days in high-risk patients or wounds, including those with moderate-to-severe injuries, hand/face involvement, puncture wounds, or immunocompromised hosts 1.
Immediate Wound Care
The foundation of dog bite management is aggressive mechanical cleansing:
- Irrigate copiously using a 20-mL or larger syringe with normal saline or warm water 2, 3
- Remove all foreign bodies and devitalized tissue through selective debridement 1, 4
- Explore the wound depth to assess for tendon, bone, periosteum, or joint capsule penetration 1
- Document neurovascular status including pulses, sensation, and range of motion of adjacent joints 2
Note: Irrigation and debridement are more valuable than antibiotics alone in preventing infection 5.
Antibiotic Prophylaxis
Who Needs Antibiotics
The IDSA guidelines 1 recommend preemptive 3-5 day antibiotic therapy for patients who are:
- Immunocompromised or asplenic
- Have advanced liver disease
- Have preexisting or resultant edema of the affected area
- Have moderate to severe injuries, especially to the hand or face
- Have injuries that may have penetrated periosteum or joint capsule
- Have puncture wounds (particularly high-risk) 6
First-Line Antibiotic Choice
Amoxicillin-clavulanate 875/125 mg twice daily orally is the first-line agent 1, 2, 3, 6. This provides coverage against both aerobic and anaerobic bacteria, including Pasteurella multocida, the most common pathogen in dog bites.
Alternative regimens (from IDSA guidelines 1):
- Ampicillin-sulbactam 1.5-3.0 g IV every 6-8 hours for severe infections
- Doxycycline 100 mg twice daily (excellent against P. multocida but some streptococci resistant)
- For penicillin allergy: combination of doxycycline or fluoroquinolone PLUS metronidazole
Common pitfall: Clindamycin alone misses P. multocida and should not be used as monotherapy 1.
Wound Closure
Primary closure may be performed for low-risk wounds, particularly:
Avoid primary closure for high-risk wounds (puncture wounds, hand injuries, delayed presentation >12-24 hours, signs of infection).
Tetanus Prophylaxis
Evaluate tetanus vaccination status for every dog bite 1, 3, 6. Current data shows only 78.7% of patients not current on tetanus actually received boosters, indicating a gap in adherence 7.
Rabies Post-Exposure Prophylaxis
Consultation with local health officials is strongly recommended to determine if rabies vaccination should be initiated 1.
When to Consider Rabies PEP:
- Dog with unknown or outdated rabies vaccination status
- Wild or stray dogs
- Unprovoked attacks
- Bites that break the skin (non-penetrating bites generally do not require PEP) 2
Rabies PEP Regimen (for previously unvaccinated patients):
The current CDC/ACIP recommendation is a 4-dose vaccine schedule 8:
- Rabies immune globulin (RIG) infiltrated into and around the wound at presentation
- Vaccine doses on days 0,3,7, and 14
- For immunocompromised patients: 5-dose regimen remains indicated 8
Important gap identified: Only 35.5% of patients bitten by dogs with outdated/unknown rabies status received rabies vaccination in one recent study 7, suggesting significant undertreatment.
Previously Vaccinated Patients:
Only 2 doses of vaccine needed (days 0 and 3), no RIG required 8.
Special Considerations
Children are the most common victims and typically present with head/neck injuries, while adults more commonly have extremity injuries 2, 3. Family dogs account for 61.3% of injuries 7, emphasizing that "familiar" does not mean "safe."
High-risk anatomic locations requiring heightened vigilance: hands, face, genitals, and any wound with potential deep structure involvement 1, 6.
Imaging is generally not required unless there is suspicion of retained foreign body, underlying structural damage, or extensive injury 2.