What's this growth on my dog's anus after diarrhea? Is it serious?

Question

This thing appeared in my dog’s anus after a day of having diarrhea non stop. I went to my vet and he told us that it’s between a tumor or an infection so I wanted to be completely sure what I’m facing. He’s 14 years old and he’s a Pekingese

Dr Stafford, BVetMed, MRCVS · Accepted Answer

From what I can see from the photo I think this looks more like inflammation or infection. Sometimes when dogs have diarrhoea they rub their bums which can lead to raw skin which in turn can become infected. Another possibility is an anal gland infection, these can burst out suddenly. There is always a possibility that it could be a tumour but it doesn't look like the typical tumours you get around the anus. With appropriate treatment an infection should heal within one to two weeks, whereas tumours would require more investigation/invasive treatment. I would chat to your bet about getting some meds for your dog if they haven't been prescribed already. Running bloods would also be prudent and may give further clues to the cause.

What's this growth on my dog's anus after diarrhea? Is it serious?

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