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Why is my dog losing weight and has swollen testicles?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 12 years old | 20 lbs

can a dog start to lose weight if they have a infection in their testicals that cause swelling?

2 Answers

Most Helpful Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on February 8th, 2019

Infections in the testicles are not generally expected to result in weight loss unless it is some on-going, low grade, chronic issue that causes the appetite to be decreased for a long period of time. An acute infection will cause a pet to not eat for a few days but this is not expected to cause a significant weight loss. I have learned though, that pet's don't always follow the expected course every single time. A cancer in the testicles will cause swelling of the testicle and will cause weight loss as it progresses and metastasizes. If you are noticing swelling in the testicles and/or weight loss, I recommend to have Bear seen by his veterinarian right away. Weight loss can occur for many reasons - from parasites to cancer to kidney disease. Best of luck and please feel free to post any additional questions.

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Other Answers

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    Answered By Linda G, MS, DVM

    Veterinarian

    Published on

    Hello. A swollen testicle could be a sign of infection or cancer, & yes, if it is chronic enough, will cause a pet to lose weight. Please have Bear looked at by your veterinarian at your earliest convenience. Thanks for using Petco Pet Education Center, formerly Petcoach.

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