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My dog lived years with untreated bone cancer. Was it misdiagnosed?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Male | neutered | 14 years and 10 months old | 7.3 lbs

Untreated Canine bone cancer means death within 3mo? My dog alive 1.5 yr no treatment Y still alive? Misdiagnosis? Past Timeline: 1.5 yrs lameleg vet visit x-ray mass on femur cancer diag 6mo an visit x-ray femur/pelivis .5 gone, no an shots 8wks lesion LS Ribs 2wks bumps up spine behind ears 2dys disorient stomach pain seizures drinking and peeing allot and still eating has bad teeth 2day 8 ice cream seized vomit Plz help!! Euth in 12hrs cuz cancer. Provide possib of something else PLZ! Infec

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Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on September 6th, 2019

Hi there. I'm afraid I don't understand all the abbreviations in your question, so it's hard for me to make sense of what you're asking. In general, I can tell you that osteosarcoma (the most common type of bone tumor in dogs) is a very aggressive type of cancer, and most dogs do not live more than a few weeks to months after diagnosis without amputation and chemotherapy. So if your dog lived for 1.5 years after the initial diagnosis, he may have simply been very fortunate, or he may have had some other type of bone tumor, or some other problem entirely - since I didn't get to examine him and the time and have not seen his x-rays, I have no way of knowing. If your dog has now passed away and you would like to get a more definitive answer as to what was wrong, I would recommend having an autopsy done - called a necropsy in animals. Your veterinarian should be able to advise you on how to arrange this, if you wish.

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