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Jane Lefler
Jane Lefler, Breeder,Behaviorist, formerVet Asst
Category: Dog
Satisfied Customers: 19826
Experience:  Former vol Vet Assistant.Breeder 18+ years Dog trainer / behaviorist
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My dog has like a blister looking big bump on his ...

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My dog has like a blister looking big bump on his tail, I have no idea what it is

Is this on the tail itself?
If so, where on the tail is it?
How large is it?
Is it next to the rectum?
Customer: replied 9 years ago.
No, it is about in the middle on the tail, growing through the hair. In size about 3 inches wide and 3 inches thick, has a round shape, it looks like a big blister

This might be an abscess especially if your dog was recently (last week or so) playing with another dog or cat that may have cause a puncture wound to the tail. With an abscess, the bacterial gets trapped under the skin when it heals and creats a pocket of blood and infection under the skin.

Dogs also have sebaceous glands in the tail that can become infected as well causing issues similar to this. Then it could also be a growth. A lump or growth is hard to diagnose even with an office visit, over the internet it is even harder as we can not even see the growth. A lump may indicate cancer, but many such growths are harmless. Many lumps are not painful or bothersome. It may be a fatty tissue deposit called Lipomas or a wart or a hematoma, but to be positive your vet will need to test the lump to be sure.

Any lump found on your animal should be tested to determine if it is a cancerous or benign lump. Your vet will want to perform a fine-needle aspiration or other appropriate test. It is performed quickly and allows some of the cells of the lump to be evaluated by the veterinary pathologist. This test will allow the vet to determine the nature of the lump and take the necessary steps to remove it. Some vets will leave it alone if it is not serious. If it is an abscess, he may just drain it and prescribe antibiotics. Lumps that are solid feeling, feel attached and fast growing should be checked as soon as possible as these are the ones that are more likely to be serious.

Here are a few sites for additional information and pictures to allow you to get an idea based on the physical characteristics..
Picture of Lipoma
Picture of Hemangiosarcoma
Picture of a mast cell tumor (mast tumor site)
Information on Canine Oral Papilloma virus apillomas.html

I hope you find this information helpful.
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