Blood in a Dog's Anal Glands

Blood in the fluid from the anal glands usually means the sacs are inflamed or infected. It's a common problem and usually treatable, but because it has come back after a course of antibiotics, it's worth going back to your vet rather than waiting.

Ask whether a sample of the fluid can be looked at under the microscope or sent for culture to choose the right antibiotic. Many vets also flush the sacs and put medicine directly into them, which often works better than pills alone. They should also feel the sacs and the area around them for any lump, because growths of the anal sacs, although uncommon, can cause similar signs.

It's also worth asking about causes of repeated anal sac problems, such as allergies, soft stools and weight. Fiber in the diet may help some dogs empty the sacs naturally. See your vet sooner if you notice swelling beside the anus, a draining sore, straining, or a change in his poop.

See anal gland problems in dogs.

This is general information, not a diagnosis. Please follow your own vet's advice.