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My dog is depressed, has a lump, green poop. What should I do?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 30 lbs

Hi, my dog lizzie has suddenly become very depressed and paranoid. She becomes alert at the drop of a hat and starts barking. At other times she is very depressed. She also has a lump on her back which is not going away. She has these small acne-like growth in and around her mouth which is very worrisome. Her poop is green. Is that a problem? Pictures are attached. What do I do?

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1 Answer

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Answered By David Darvishian

Veterinarian

Published on August 7th, 2017

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Great to meet you and Lizzie. The behavioral things are best to be discussed with your vet. Many factors come into play and without a detailed history it's just too hard to start to figure it out. The lump probably needs to be evaluated unless it resolves. Lumps fall into 5 main categories including infection/abscess, granuloma (a collection of inflammatory cells), cyst or a fluid or sebaceous filled pocket, hematoma or blood filled pocket, seroma or fluid filled pocket, or a tumor which can benign or cancerous. Your vet can evaluate it and advise what tests to do and how to treat it if it persists. The mouth certainly looks like a papilloma virus infection or papillomatosis. This should resolve with time. If the green stools continue, again consult your vet. A physical exam, fecal tests, blood tests, or x-rays may be needed to diagnose that problem. The stool looks firm and normal otherwise. Continue to monitor that. Good luck with Lizzie.

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