Dog or cat bites: essential first aid to know

Animal bites — with dogs and cats leading the way — are among the most frequent injuries in Quebec, particularly during the summer when park outings and outdoor activities increase. According to the Public Health Agency of Canada, hundreds of thousands of animal bites occur annually across the country. The good news: most minor bites can be managed very well at home with the right first aid for a dog or cat bite. Here's how to react effectively.

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Dog bite vs. cat bite: two very different realities

We tend to treat all bites the same way, but there's a significant difference between a dog and a cat bite.

A dog bite is generally wider and more tearing — the wound is visible and often bleeds easily. Paradoxically, this type of open wound cleans better and carries a slightly lower risk of infection.

A cat bite, on the other hand, is more insidious. A cat's fangs are thin and sharp: they deeply puncture the skin and then close the wound at the surface. This seemingly minor wound can conceal a deep inoculation of bacteria. Cat bites are statistically more likely to become infected — some studies estimate the risk of infection at over 50% for cat bites not treated promptly.

In both cases, the first aid steps are essentially the same. But a cat bite requires increased vigilance for signs of infection in the hours that follow.

Immediate first aid steps

As soon as a bite occurs, follow these steps without delay:

1. Move away from the animal and get to safety. Do not try to feed or calm an animal that has bitten — it may bite again.
2. Rinse the wound thoroughly with running water for at least 5 minutes. Use lukewarm tap water and let it flow — this is the most important step to remove bacteria from the wound surface.
3. Wash with mild soap. Gently rub the edges of the wound with neutral liquid soap, then rinse thoroughly again. Avoid highly concentrated alcohol or hydrogen peroxide solutions directly in the wound — they can irritate tissues and slow healing.
4. Control the bleeding with a clean sterile compress. Apply firm, constant pressure for 5 to 10 minutes. If the bleeding is heavy and does not stop, maintain pressure and call 911.
5. Cover with a sterile dressing. Once bleeding is controlled, cover the wound with a sterile compress and a clean dressing. Avoid overly tight dressings that could create a moist environment conducive to bacteria.

Your first aid kit should always include sterile compresses, dressings of various sizes, and cleaning supplies for this type of situation.

When to see a doctor or go to the emergency room?

Certain situations require medical evaluation, even if the wound seems benign:

• Deep or large bite that might require stitches
• Bleeding that does not stop after 10 to 15 minutes of firm pressure
• Bite to the face, neck, hands, or joints — areas at increased risk of complications
• Unknown, stray, or suspicious animal — rabies risk to be assessed by a doctor
• Immunocompromised, diabetic, or elderly victim — increased risk of infection
• Child bitten — always consult, even for a seemingly superficial bite
• Cat bite, even minor — the depth of the wound is often underestimated
• Tetanus vaccination not up to date (booster required every 10 years)

When in doubt, consult a doctor. A doctor can assess if antibiotic prophylaxis is indicated and check your vaccination status.

Signs of infection to watch for

Even a well-cleaned bite can become infected. Watch for the following signs within 24 to 72 hours of the bite:

• Increasing redness around the wound, which gradually spreads
• Significant swelling or increasing localized warmth
• Pain that intensifies instead of subsiding
• Discharge of pus (cloudy or yellow-green fluid)
• Fever — a sign that the infection is starting to become systemic
• Swollen lymph nodes in the affected limb area

If any of these signs appear, see a doctor without delay. An untreated infection can progress rapidly, especially with bacteria typical of cat bites (Pasteurella multocida), which can cause deep infections within hours.

Bites and children: additional precautions

Children are the primary victims of dog bites, often on the face, neck, or arms. Their immune system is more vulnerable, and facial wounds can have significant aesthetic consequences. In case of a bite on a child:

• Calmly reassure them before treating — panic amplifies perceived pain.
• Apply the same first aid steps (thorough rinsing, compression, dressing).
• Systematically consult a doctor, even for a seemingly superficial bite.
• Note information about the animal and its owner to pass on to authorities and the doctor.

Preventing bites: good practices

Prevention remains the best protection, especially with children:

• Do not leave a child alone with a dog, even a familiar and known animal.
• Approach unknown dogs with caution: first ask the owner for permission, extend your hand low, palm down, and let the animal sniff.
• Avoid disturbing an animal that is eating, sleeping, or caring for its young.
• Do not intervene between two fighting dogs with bare hands — use a stick or an intermediary object.
• Teach children never to bring their face near a dog's mouth, even a familiar one.

Key takeaways

When faced with a dog or cat bite, the most important reflex is thorough rinsing with running water for several minutes — this is the action that makes the most difference in limiting the risk of infection. Then: mild soap, compression, sterile dressing. And if the wound is deep, if the animal is unknown, or if the victim is a child, consult a doctor without delay.

Equip your home and workplaces with a complete first aid kit, including sterile compresses and appropriate dressings for this common type of injury.

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Disclaimer: This article is provided for educational purposes only. It does not replace the advice of a healthcare professional or certified first aid protocols. In case of emergency, call 911.