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My dog has a lump on its tail. Is it cancer or something else?

Updated On September 23rd, 2025

Pet's info: Dog | English Springer Spaniel | Male | unneutered | 5 years old

I am worried about what is on my dogs tail, I don’t no what it is, it could be nothing but I have a vet appointment booked for Friday 20th but I can’t stop thinking about it and looking at it, can someone please advise and help settle my head, I have googled and now I have in my head it’s cancer... Thank you

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1 Answer

Most Helpful Answer

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Answered By Destini R. Holloway, DVM

Veterinarian

Published on December 18th, 2019

It is hard to tell for sure based on the photo due to the hair there and also the way the swelling looks. I can certainly tell however that it has opened up and healed over in the center at some point. This is likely either due to trauma or the fact that it has grown so large and is running out of room. If the swelling has been there for more than a few weeks, then we have to assume this is a mass and therefore have it tested to find out what kind of mass it is. If it just showed up and is bothering Lucky, then there is a chance it is an inflammatory lesion, and that medications can help it resolve. This can really go either way, so unfortunately you will have to wait a bit until your vet can look at it on Friday. The vet may also offer to have it tested to be sure. I do hope that things go well moving forward with Lucky and this swelling on his tail. Best wishes and take care.

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