Unfortunately, it's bad news. It's Osteosarcoma. Bone cancer. :sad3:
It's very likely it will recur as well as spread. I am to give Rylee metacam every day and cold compresses. Both have shown to regress that cancer in dogs. She can't say if it's hereditary, but it seems to be familial. But hopefully just a fluke thing in Rylee.
Now excuse me while I go hug my Rylee. :cry3: