Medical Treatment of Dog Bites and Tick Bites
For dog bites, immediately clean and irrigate the wound with normal saline, then prescribe amoxicillin/clavulanate for antibiotic prophylaxis, especially for high-risk wounds (puncture wounds, hand injuries, cat bites, or immunocompromised patients). 1 For tick bites, remove the tick immediately with fine-tipped tweezers pulling straight upward, and if the bite occurred in a Lyme-endemic area with an engorged Ixodes tick attached ≥36 hours, prescribe a single 200 mg dose of doxycycline within 72 hours of removal. 2, 3
Dog Bite Management
Immediate Wound Care
- Clean and copiously irrigate the wound with normal saline using a 20-mL or larger syringe or 20-gauge catheter attached to the syringe 1
- Explore the wound for tendon or bone involvement and foreign bodies 1
- Consider primary closure for cosmetically favorable wounds (facial wounds or gaping wounds) if infection risk is low 1, 4
Antibiotic Prophylaxis
Amoxicillin/clavulanate is the first-line prophylactic antibiotic for dog bites 1, 4. Consider prophylaxis particularly for:
- Puncture wounds
- Hand wounds
- Cat bites (which cause deeper puncture-type wounds)
- Immunocompromised patients 1
The evidence supports antibiotic use to reduce infection risk, though research has limitations regarding patient-specific criteria 5. Given the significant burden (337,000 emergency visits annually in the US) and potential for life-threatening complications, prophylaxis should be strongly considered for all bites 4.
Additional Considerations
- Evaluate tetanus vaccination status and update if needed 4
- Assess rabies prophylaxis need - even domestic animals are often unvaccinated. Postexposure prophylaxis consists of immune globulin at presentation plus vaccination on days 0,3,7, and 14 1
- Document neurovascular function (pulses, sensation) and range of motion of adjacent joints 4
- Imaging is usually unnecessary unless foreign body, structural damage, or extensive injury is suspected 4
Tick Bite Management
Immediate Tick Removal
Remove the tick as soon as possible using fine-tipped tweezers or a commercial tick removal device 2, 3. The technique matters:
- Grasp the tick head as close to the skin as possible
- Pull upward with steady, even pressure 2, 3
- Do NOT burn the tick or apply petroleum jelly, fingernail polish, alcohol, or other chemicals - these methods are ineffective 3, 6
Early removal is critical because infection risk increases substantially after 24-48 hours of attachment 2.
Antibiotic Prophylaxis Decision Algorithm
Prophylactic doxycycline is indicated ONLY if ALL three criteria are met 3:
- Identified Ixodes scapularis (deer tick) - submit tick for species identification 3
- Highly endemic Lyme disease area (e.g., northeastern United States)
- Tick attached ≥36 hours (assess degree of engorgement)
If these criteria are met:
- Adults: Single dose of 200 mg oral doxycycline within 72 hours of tick removal 3, 7
- Children: Single dose of 4.4 mg/kg (maximum 200 mg) within 72 hours 3
This regimen is 87% effective in preventing Lyme disease 7. However, efficacy drops dramatically with delayed treatment - animal studies show protection falls to 47% at 24 hours and becomes ineffective ≥2 days post-removal 8.
Important Caveats for Tick Bites
Do NOT give prophylactic antibiotics if:
- The bite is equivocal or low-risk (doesn't meet all three criteria above) 3
- More than 72 hours have passed since tick removal 3
- In Rocky Mountain Spotted Fever endemic areas - prophylaxis is NOT recommended; instead, start doxycycline only at first sign of fever or rash 2
Do NOT test asymptomatic patients for Borrelia burgdorferi exposure following a tick bite 3.
Follow-up for Tick Bites
Patients with high-risk tick bites should receive prompt consultation with a healthcare professional within 72 hours after removal of an engorged tick 2. Watch for erythema migrans (expanding red rash), which develops more frequently after nymphal tick bites (5.6%) compared to adult female tick bites (0%), particularly with engorged nymphs (9.9%) 7.
If erythema migrans develops, treat with:
- 10-day course of doxycycline, OR
- 14-day course of amoxicillin or cefuroxime axetil 3
Symptomatic Treatment
For local symptoms from either bite type: