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My dog has a hard lump under his rib and isn't eating. Should I worry?

Updated on September 23rd, 2025

Pet's info: Dog | Jack Russell Terrier | Male | unneutered | 12 years and 1 month old | 25 lbs

Left flank under last ribb a hard round 1"by 1" mass , doesn't seam to be painful , he hasn't been eating right

1 Answer

Most Helpful Answer

Makenzie Kurth, DVM

Answered By Makenzie Kurth, DVM

Veterinarian

Published on February 20th, 2018

I’m sorry to hear about Pete! Unfortunately, I can’t help a whole lot without feeling the lump myself. This could be anything from a benign dermal cyst to bone cancer of the rib.

I will say that any 12 year old dog who isn’t eating normally should see the vet sooner rather than later. I always worry for organ dysfunction (liver/kidney/heart disease) and of course cancer.

Do yourself a favor and take Pete in for a physical exam to help decide if the lump is important and what else may be going on. Depending of what your vet finds on the physical exam, he or she may recommend bloodwork and/or cytology (poking the mass with a slim needle and looking at the cells under the microscope) to determine if it needs to be removed or just monitored.

Hope this helps and best of luck to you and Pete!
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