Hi Carrie, thanks for joining us here, we're so glad you found Tripawds to be helpful. And it's wonderful that Charlie is doing well. He's a handsome pup!

Yes, STS is the blanket term for a variety of tumors, and a lot of Tripawds have lost their leg because of them. I'm thinking that when you searched for "soft tissue sarcoma" you probably didn't use the advanced search feature. I used it and searched for "exact phrase" and these are the search results I've found for Tripawds with soft tissue sarcomas. As you can see, there are a lot of results that come back. One interesting bit I found from Tazziedog, our favorite vet here at Tripawds, was this:

It would be very rare for soft tissue sarcoma to come back in another leg.  We do see other tumors that arise from ligaments or other structures in the joint. These would include nerve sheath tumors or hemangiopericytomas.  Many of these are either benign or slow-growing so surgery and biopsy is the smartest thing to do.  

I hope you get an accurate result back from the lab too. A few pups here weren't able to, which can be frustrating, but at least the pain from the leg tumor was gone and their folks had a general idea of what they were dealing with. What I would want to know from my vet is, what are the chances of it coming back and in what location, and what type of post-surgery treatment option would you recommend? If chemo is recommended, what type and how many sessions? And of course, what are the associated costs? And if I don't do chemo, what are the statistical odds of survival? 

Whatever decisions you make that come next, always remember that there are no right or wrong ones. As long as you make your decisions based on love, and Charlie's quality of life, that's all that matters. 

Paws crossed for a speedy recovery! Keep us posted on what you find out.