Abscesses in dogs are localized pockets of pus that form in response to infections. They occur when the body's immune system works to contain bacteria or other harmful pathogens that enter through a ...

Normally, when a dog poops, the fluid in their anal sacs is squeezed out, too. ... Left untreated, the impaction will turn into an infection. Look for yellow or bloody pus oozing from their sacs.