I co-own an 11 year old retired hunting dog with an old and very trusted breeder friend. He was bred by me and generally comes back for visits several times a year, and it's likely that after his last visit I'll soon be taking him back permanently.
The last time I saw him was about 5-6 weeks ago. He's had a fatty tumor on his chest for about 2.5 years, possibly a little longer, in the exact same spot his mother had one before we found a mammary tumor on her. Incidentally, towards the end, his mother's lipoma began to grow, harden and discolor- not sure if the cancer had spread there, or the lipoma itself just turned cancerous (or always was).
Anyway, this dog was seen by my Vet when I had him here last time, and the lipoma was examined and dismissed as just a fatty growth at that time. Also, I should mention his blood work came back normal, as well.
Last night my co-breeder brought him here again, and I happened to notice a dark spot on the lump. It's very strange, though. The lipoma does not feel the same - its definitely harder, but oddly enough, it seems a bit smaller, especially in the area of the discoloration, where it is also slightly depressed. It's difficult to tell from the pictures I've taken, but the skin on the dark area is very dry and peeling.
My co-breeder thought it might be shrinking, healing and/or ready to burst. She also believes it could be an allergic reaction to the new food she started using about 2-3 weeks ago. My first thought was this has turned malignant.
He has a Vet appointment scheduled for Tuesday, so we'll know more then, but I'm curious if anyone has actually seen benign fatty tumors shrink or burst? It seems crazy, but in a way, the darkened area does
look almost shriveled, not at all like any tumor I've ever seen, so maybe there is something to my co-breeder's theory?