Burnees Medical Fund

My best friend Burnee developed a large lump on his leg in a short amount of time. The vet is saying it’s looking like he may need to get the leg amputated. First he wants to do a biopsy to see what exactly he’s dealing with. Just by looking at it though, he said due to the location, the rate it’s growing, & the pain Burnee is feeling in his knee it’s most likely in his joints already. He said it’s really hard to remove all of it from an area like that without amputation. Any help at all is extremely appreciated!