My dog has a painful lump on her stomach near a nipple. What is it?
Updated On September 23rd, 2025
Pet's info: Dog | Mixed Breed Small (up to 22lb) | Female | unspayed
Hello! My dog has a ball on her stomach where one of her nipple is. It hurts her if we touch it. I was wondering what the possibilities were.
4 Answers
Most Helpful Answer
Published on October 30th, 2017
Hi. This is a very big mass. If it is firm and painful, this is concerning in an unspayed, older pet is cancer unfortunately. Besides a cancer, other possibilities include infection, cyst, lipoma, a benign mammary tumor, hernia, etc. She should be fully checked out and have the mass sampled to get an answer. The sooner the better in this case.
4Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on May 15th, 2019
These sound like mammary tumours (similar to breast cancers). Please have her assessed urgently as surgical removal may be recommended as soon as possible as long as there is no evidence they have spread internally
1Pet Parents found this answer helpful
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Published on May 18th, 2019
It is impossible to say for sure but approximately 50% of mammary (breast) lumps are cancerous and they are particularly concerning in older and entire (non-neutered) females add if there is any discoloration (appears bruised in picture), pain or discharge. I strongly recommend an urgent vet check given the red flags which are present
1Pet Parents found this answer helpful
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Published on February 4th, 2020
Unfortunately cancer is a possibility. I see that Viski isn't spayed, and dogs who aren't spayed have a 25% chance of developing mammary tumors. If they do develop mammary tumors, 50% of them are malignant.
1Pet Parents found this answer helpful
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