My dog has a black spot on his anus that's getting bigger. Is it serious?

Question

Hi, I noticed a black pigment on my dog's anus several months ago and it seems to be getting larger and darker. I am attaching a before and after photo. The pigment is not raised. Should I be concerned? Thanks in advance. Pet's info: Dog | Chihuahua | Male | unneutered | 10 lbs

Ricardo Fernandez, DVM · Accepted Answer

Thanks for using Petco Pet Education Center, formerly Petcoach! This is unlikely to be something of concern and most likely represents a region of pigmentation. However, I recommend you keep a close eye on it and if at some point it appears to become a mass, have him evaluated by a veterinarian for further assessment. Good luck and have a good night!

My dog has a black spot on his anus that's getting bigger. Is it serious?

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