Skycat, the vet is in touch with Liverpool University to see if Radiotherapy/Chemo would be of any use, another option is to amputate the leg, but as the dog wasn't well enough to do a biopsy until he'd been home for 4 weeks I can't imagine him being strong enough to consider that, and even then, He went into those kennels a big fit healthy lad, he' a shadow of himself now, it's not my place to say what should happen, so I'll leave it there.
Dawn, I don't think the vet would answer that question, or even if he could answer it.
Either way the bit that matters is that it wasn't spotte