If another dog has bitten your dog, your first priorities are separating the animals safely, controlling any bleeding, and getting to a veterinarian as quickly as possible. Even small puncture wounds can hide serious damage underneath, so a professional assessment matters more here than it might appear.
Separate the Dogs and Stay Calm
Before you can help your dog, you need to end the encounter. Never put your hands near either dog’s mouth during a fight. Instead, make a loud noise, spray water if available, or grab the aggressor’s back legs and pull backward in a wheelbarrow motion. Once separated, move your dog to a quiet, secure area. An injured dog may snap or bite out of pain and fear, even with their owner, so approach slowly and speak in a calm voice. If your dog is showing signs of aggression or extreme panic, you can loosely wrap a jacket or towel around their head to reduce stimulation while you assess the wounds.
Assess the Wound Quickly
Look your dog over carefully, parting the fur to find every puncture, tear, or area of swelling. Dogs have loose skin and thick coats, which means bite marks are easy to miss. Check the neck, belly, legs, and ears, not just the obvious spots.
What you see on the surface almost never tells the full story. Veterinarians describe severe bite injuries using an “iceberg effect”: because a dog’s canine teeth are angled, they don’t go in and out cleanly. Instead, they tear through layers of tissue. With a bite force around 450 psi, the teeth can separate muscle from bone and skin from the tissue beneath it, all through what looks like a small puncture on the outside. This is the single most important thing to understand about dog bites. A wound that seems minor can involve crushed muscle, torn blood vessels, and dead tissue below the surface.
Basic First Aid Before the Vet
If there’s active bleeding, apply firm, direct pressure with a clean cloth or gauze for several minutes. Bright red blood that pulses indicates an arterial bleed, which is more urgent. Dark, steady bleeding is venous and generally easier to control with pressure. For either type, keep the pressure on and head to the vet immediately.
If bleeding is minimal or has stopped, you can gently clean the wound. The gold standard for bite wound care is generous irrigation with saline solution. You can make a basic saline rinse by dissolving one teaspoon of table salt in two cups of warm water. Pour it slowly over and into the wound to flush out bacteria and debris. Avoid hydrogen peroxide or rubbing alcohol, both of which damage tissue and slow healing. Don’t attempt to bandage puncture wounds tightly, as trapping bacteria inside a closed wound increases the risk of abscess.
This first aid is a bridge to veterinary care, not a replacement for it.
Why a Vet Visit Is Essential
Because of the iceberg effect, your vet needs to evaluate what’s happening beneath the skin. This typically involves shaving the fur around the wound, probing the depth of punctures, and sometimes imaging to check for damage to deeper structures. Many bite wounds require debridement, the removal of dead or contaminated tissue, to prevent infection from taking hold.
For deeper or more extensive injuries, your vet may place a surgical drain, a small tube that allows fluid and bacteria to escape rather than pooling under the skin. An emergency vet exam generally runs $100 to $150, while cases requiring surgery can range from $2,000 to $5,000 depending on the severity and your location. Costs vary widely, so ask about estimates upfront if finances are a concern.
Infection Risk Is High
Dog mouths carry a complex mix of bacteria. Pasteurella, one of the most common pathogens in dog saliva, is found in roughly 50% of dog bite wound cultures. But it’s far from the only concern. Bite wounds also commonly harbor Staphylococcus, Streptococcus, various gram-negative bacteria, and anaerobic organisms that thrive in the low-oxygen environment of a deep puncture.
Because of this bacterial cocktail and the crushed tissue left behind by the bite, veterinarians typically prescribe antibiotics early in the treatment process. Starting antibiotics before visible signs of infection appear gives the best chance of preventing a serious problem. Signs of infection usually show up within about 24 hours of the bite. Watch for increasing redness or swelling around the wound, warmth to the touch, discharge (especially if it turns thick, yellow, or foul-smelling), fever, lethargy, or loss of appetite. If any of these develop after your initial vet visit, go back promptly.
Check Your Dog’s Rabies Status
Rabies is rare in domestic dogs in the United States, but it’s nearly always fatal once symptoms appear, making it a non-negotiable concern. Check whether your dog’s rabies vaccination is current. All licensed rabies vaccines for dogs require a booster one year after the initial dose, then every one to three years depending on the vaccine formulation and local laws. Rabies vaccination is legally mandated in most U.S. jurisdictions, though the specific requirements vary by state and even by county.
If the dog that bit yours is a known pet, try to get the owner’s contact information and confirm that dog’s vaccination status. If the biting dog was a stray or its vaccination history is unknown, tell your vet immediately. They can contact your local or state health department for a risk assessment and guidance on next steps. Antibody testing is not considered a reliable substitute for vaccination, so don’t assume a previously vaccinated dog is automatically protected if their boosters have lapsed.
Document Everything
While the medical side is your top priority, the practical side matters too. Take photos of your dog’s injuries before and after cleaning, including close-ups and wider shots that show the location on the body. Write down the date, time, and location of the incident. If another owner was involved, get their name, phone number, and their dog’s vaccination records if possible.
File a report with your local animal control agency. This creates an official record, which is important if the biting dog has a history of aggression or if you need to pursue compensation for veterinary bills. Many jurisdictions hold the biting dog’s owner liable for damages, but the specifics depend on local laws. Your vet records and photos serve as key evidence.
Recovery at Home
Most dogs with properly treated bite wounds recover well, but the healing process takes active management. Your vet will likely send you home with antibiotics and possibly pain medication. Give the full course of antibiotics even if your dog seems fine after a few days, as stopping early invites resistant bacteria to take hold.
Use an e-collar (cone) to prevent your dog from licking or chewing at the wound. Saliva introduces more bacteria, and licking disrupts tissue repair. Check the wound at least twice daily for signs of increasing swelling, discharge, or odor. Keep your dog calm and limit physical activity, especially if drains were placed or sutures are present. Most uncomplicated bite wounds heal within two to three weeks, though deeper injuries may take longer and require follow-up visits for drain removal or wound rechecking.
Your dog may also show behavioral changes after being attacked, including fear of other dogs, increased reactivity on walks, or general anxiety. These responses are normal. If they persist beyond a few weeks, working with a certified animal behaviorist can help your dog regain confidence.