Do Not Suture Dog Bite Wounds (Except Facial Wounds)
Primary wound closure is NOT recommended for dog bite wounds, with the important exception of facial wounds, which should be closed after copious irrigation, cautious debridement, and preemptive antibiotics. 1
Wound Management Algorithm
Facial Wounds: CLOSE THEM
- Facial dog bite wounds should be sutured after proper wound preparation 1
- Perform copious irrigation first
- Perform cautious debridement of devitalized tissue
- Administer preemptive antibiotics (see below)
- Primary closure is safe and improves cosmetic outcomes significantly 2, 3
Non-Facial Wounds: DO NOT CLOSE
- Leave wounds open or at most approximate them loosely 1
- The IDSA guideline provides a "strong" recommendation against primary closure for non-facial bite wounds
- Hand wounds are particularly high-risk for infection when closed 1
Critical Wound Care Steps
- Irrigation: High-pressure irrigation to remove foreign material and bacteria
- Debridement: Remove devitalized tissue and reduce bacterial load
- Tetanus prophylaxis: Administer if >5 years since last dose for dirty wounds, or >10 years for clean wounds; prefer Tdap over Td if not previously given 1
Antibiotic Recommendations
Preemptive antibiotics for 3-5 days are indicated if the patient has: 1
- Immunocompromised status
- Asplenia
- Advanced liver disease
- Preexisting or resultant edema
- Moderate to severe injuries, especially hand or face
- Injuries penetrating periosteum or joint capsule
First-line antibiotic: Amoxicillin-clavulanate 875/125 mg twice daily 1
- Covers Pasteurella multocida (common in dog bites), streptococci, staphylococci, and anaerobes
- Alternative: Doxycycline 100 mg twice daily (excellent against Pasteurella)
Evidence Discussion
The IDSA 2014 guidelines provide the strongest recommendation against closure, rating it as "strong" despite "low" quality evidence 1. This reflects clinical consensus that the risk of trapping bacteria and creating an anaerobic environment outweighs cosmetic benefits for most body sites.
The facial exception is critical: Facial wounds have better blood supply, lower infection rates, and significant cosmetic implications. Research supports this approach—one RCT found facial dog bite wounds closed immediately had only 6.3% infection rate with significantly better cosmetic outcomes 3. Another study showed primary closure of dog bites resulted in similar infection rates but vastly superior cosmetic appearance (Vancouver Scar Scale: 1.74 vs 3.05) 2.
Common Pitfalls to Avoid
- Don't close hand wounds: These have higher infection rates when sutured 1
- Don't skip irrigation: This is more important than antibiotics for preventing infection 4
- Don't use high-pressure irrigation: May drive bacteria deeper into tissues 4
- Don't forget rabies assessment: Consult local health officials about post-exposure prophylaxis 1
The "6-Hour Rule" Is Outdated
Multiple studies confirm the traditional "golden period" of 6-8 hours for wound closure is not evidence-based 5, 6, 7. However, for dog bites specifically, this doesn't matter because you shouldn't be closing them anyway (except facial wounds). One study showed wounds treated within 8 hours had 4.5% infection rate vs 22.2% after 8 hours 2, so earlier treatment is still better—but the decision to close should be based on location, not time.