Bites and puncture wounds can both lead to abscesses.
Your dog can sustain puncture wounds in fights with another animal, stepping on a sharp object, or even running into a broken branch or stick. These problems are most common in dogs that roam free outside.
Unlike superficial lacerations or abrasions, bites and punctures tend to carry material into the wound. It can seal over and trap bacteria inside.
When this happens, the wound often becomes infected and can develop into a large, pus-filled abscess. Punctures that penetrate entirely through the wall of the chest or abdomen are rare. However, they are severe problems that require emergency treatment and surgery.
Abscesses
Abscesses are especially common in fight wounds.
Numerous bacteria are found in the mouth. They are carried deep into the skin and underlying tissues by the teeth. The small wounds left by the bite on the skin surface seal over quickly, trapping the bacteria deep inside. A large pus pocket develops within a day or two, which may be warm and fluctuating to the touch. Yellow, gray, or greenish pus may ooze from the wound, and the pus pocket may rupture spontaneously after several days.
What does it look like
The signs of illness depend on the area affected and the nature of the bite or puncture.
Punctures on the foot or leg can cause lameness and swelling of the limb. In addition, nearby lymph nodes, such as those in the neck, the front of the chest, or behind the knee, can swell in response to infection.
Your veterinarian will examine your dog closely. They will look for any signs of a puncture or bite wound, including a deeper abscess. In some cases, they may recommend x-rays to look for foreign material and to gauge the depth and severity of the puncture or wound.
Treatment
Antibiotics are needed to fight infection. In addition, anesthesia and surgery are often necessary to open, drain, and flush out the abscess.
In some cases, your vet will place a drain in the wound to prevent the skin opening from sealing over and to allow continued drainage during healing. Warm compresses can be used to stimulate drainage and blood flow. Puncture wounds on the feet often respond well to foot soaks in warm, antiseptic solution.
Related articles:
Canine Wound Care 101: Classification, treatment, and physical therapy
Further reading:
Bite Wounds in Dogs