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My dog's X-ray shows osteosarcoma. Is it really osteomyelitis?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | neutered | 14 lbs

My dog has had a recent x ray and my vet has said that he has Canine Osteosarcoma they wanted to put him to sleep there and then even though no biopsy had been done I refused and bought him back home as he is in good spirits eating well going to toilet regularly just walking carrying the back leg could it be Osteomyelitis as he was also being treated for a fungal infection on his front paw

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1 Answer

Most Helpful Answer

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Answered By Kevin Sanada, DVM

Veterinarian

Published on October 26th, 2017

Osteomyelitis and osteosarcoma can look similar, but there are some distinct characteristics that can be seen on x-rays. The image you provided is very blurry, but I do see the lesion and it does look more suspicious of an osteosarcoma. This is not only because of the location (the knee is a common location for osteosarcoma), but also the fact that it is solitary and has not crossed the joint. However, a biopsy and histopathology is the only way to definitively diagnose the condition. Osteosarcoma is unfortunately a rather severe form of cancer that tends to spread quickly and cause a great deal of pain. If Ben is in good spirits though, then I would not advise euthanasia until he doesn't seem happy anymore. Considering that you are interested in more diagnostics and potentially treatment (there are treatment options for osteosarcoma), I recommend you ask your vet about this, or seek a second opinion. I hope that helps and I'm really sorry to hear about poor Ben.

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