Why Is There Swelling Under My Dog's Tail?
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Poor pup! This lump could be an impacted anal sac, a cyst, an abscessed anal sac, an abscess, a benign tumor or a malignant tumor. If it was a problem with his anal sac, it may have to be expressed by your vet. Any suspicious lumps should be examined by your vet. Your vet can perform a test called a fine needle aspirate on it if they feel it would be diagnostic. To do this, your vet sticks a small needle into the lump to get a sample of its cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. I would take him into your vet during normal business hours in the next day or two.
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If he is an older dog it could be a skin nodule or tumor of some kind. If it's off at about the 10 or 2 o clock position, it could be an impacted anal gland. I recommend getting him checked out by your vet as soon as possible. If it is anal glands, it may be able to be expressed to get the material out of the gland and be done with it. Infection may require antibiotics, but if it's not an anal gland, they will need to examine a sample of material from the lump to identify it. Based on these results, your vet will be better able to tell you what's going on and how best to treat it.
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