What is the appropriate management of a dog bite in a child, including wound irrigation, tetanus immunization, rabies prophylaxis, and antibiotic therapy?

Management of Dog Bites in Children

For a child with a dog bite, immediately irrigate the wound copiously with sterile normal saline, administer prophylactic amoxicillin-clavulanate 875/125 mg twice daily for 3-5 days if the wound is on the hand/face or moderate-to-severe, give tetanus toxoid if not vaccinated within 10 years (Tdap preferred), and confine the dog for 10-day observation without starting rabies prophylaxis if the dog is healthy and available. 1, 2

Immediate Wound Care

• Perform copious irrigation with sterile normal saline using a 20-mL or larger syringe to mechanically remove bacteria and debris—this single intervention markedly reduces both infection and rabies transmission risk 1, 2, 3
• Carefully debride only superficial devitalized tissue without unnecessarily enlarging the wound 1, 2
• Avoid high-pressure irrigation streams, as they can force bacteria deeper into tissues 1
• Examine for deep structure involvement: assess neurovascular function (pulses, sensation), range of motion of adjacent joints, and look for disproportionate pain that may indicate periosteal or joint capsule penetration 1, 2, 4

Antibiotic Prophylaxis

Administer prophylactic amoxicillin-clavulanate 875/125 mg twice daily for 3-5 days for high-risk wounds, which include: 5, 1, 6

• Hand, foot, face, or genital area wounds
• Moderate-to-severe injuries
• Wounds that may have penetrated periosteum or joint capsule
• Immunocompromised patients, asplenic patients, or those with advanced liver disease
• Pre-existing edema of the affected area

Do NOT start prophylactic antibiotics if presentation occurs ≥24 hours after the bite with no clinical signs of infection 1

Amoxicillin-clavulanate is first-line because dog bite wounds contain an average of 5 bacterial species, with 60% having mixed aerobic-anaerobic flora including Pasteurella multocida, Staphylococcus aureus, streptococci, Eikenella corrodens, and multiple anaerobes 5, 1, 6

Wound Closure Decisions

• Facial wounds: Primary closure is acceptable after thorough irrigation, cautious debridement, and initiation of prophylactic antibiotics to achieve optimal cosmetic outcomes, ideally by a plastic surgeon 5, 1, 2
• Non-facial wounds: Avoid primary closure—instead, loosely approximate margins with adhesive strips (Steri-Strips) and plan for delayed primary or secondary closure 5, 1, 2
• Never close infected wounds or puncture wounds primarily 1, 2
• Hand wounds require special caution due to heightened risk of septic arthritis, osteomyelitis, and functional impairment—these should generally not be sutured 5, 1

Tetanus Prophylaxis

• Administer tetanus toxoid 0.5 mL IM if the last dose was >10 years ago for clean wounds, or >5 years ago for contaminated wounds, or if vaccination status is unknown 5, 1, 2
• Tdap is preferred over Td if the patient has not previously received Tdap 5, 1, 6

Rabies Risk Assessment and Prophylaxis

If the Dog is Healthy and Available for Observation:

• Confine and observe the dog daily for 10 days WITHOUT administering rabies vaccine during the observation period 1, 2, 6
• A healthy domestic dog that remains alive and healthy for 10 days would not have been shedding rabies virus at the time of the bite 1, 2
• Only initiate rabies PEP if the dog develops signs of rabies during observation (behavioral changes, paralysis, excessive salivation, aggression, neurological signs) 1, 2
• If signs develop, euthanize the animal immediately and submit the head for laboratory testing while simultaneously starting PEP 1, 2

Immediate Rabies PEP is Indicated When:

• The dog is stray, feral, wild, or cannot be confined for observation 1, 2
• The dog's rabies status is unknown or cannot be determined 1, 2
• The bite occurred in a region with high rabies prevalence 1, 2
• The dog develops signs of illness during the 10-day observation period 1, 2

Complete Rabies PEP Regimen (If Indicated):

For previously unvaccinated individuals: 1, 2

• Human rabies immune globulin (HRIG) 20 IU/kg on day 0—infiltrate the full dose around and into the wound if anatomically feasible, with remaining volume injected IM at a site distant from vaccine administration
• Rabies vaccine series: 4 doses on days 0,3,7, and 14 (some older protocols use 5 doses including day 28)
• Never administer HRIG in the same syringe or at the same site as the vaccine
• Administer vaccine IM in the anterolateral thigh (for young children) or deltoid—never use the gluteal region due to lower antibody titers 2

For previously vaccinated individuals: 1

• Administer only 2 doses of vaccine on days 0 and 3
• Do NOT give HRIG, as it will suppress the anamnestic antibody response

Initiate PEP within 24 hours of exposure, but delayed initiation is still recommended even after prolonged delays since incubation periods exceeding 1 year have been documented 1, 2

Follow-Up Care

• Schedule follow-up within 24-48 hours (by telephone or in-person) to reassess wound status, evaluate for signs of infection, and ensure compliance with prophylaxis 1, 2, 6
• Hospitalize if infection progresses despite appropriate antimicrobial therapy 1, 2

Treatment of Established Infections

If infection develops despite prophylaxis: 1, 6

• Uncomplicated soft tissue infection: Amoxicillin-clavulanate 875/125 mg twice daily for 7-10 days
• Septic arthritis: 4 weeks of antibiotic therapy
• Osteomyelitis: 6 weeks of antibiotic therapy

Critical Pitfalls to Avoid

• Do not use high-pressure irrigation—it disseminates bacteria into deeper tissues 1
• Do not close infected wounds, puncture wounds, or high-risk non-facial wounds primarily 1, 2
• Do not withhold rabies PEP while waiting for the 10-day observation period if the dog is unavailable or shows any signs of illness 1
• Do not start prophylactic antibiotics if presentation is ≥24 hours post-bite without signs of infection 1
• Always consult local health officials for regional rabies epidemiology—dog rabies is rare in the United States but varies significantly by region 1