We just found out our dog has invasive lipoma in her right hip. The hip is twice the size of the other one. Basically, it's fat that has fused into the muscle and can't be removed. She doesn't seem to be in pain (yet) and it doesn't interfere with her walking, but the vet said it will have to be amputated. She said she's seen it take up to two years before it's that bad, but it grew very fast already. I dread that day, our pooch LOVES to run.
We already spent $600 for tests and a ultrasound, but we do have insurance through Healthy Paws.