When Roscoe started loosing weight, I did not think it was a concern as this was what happened every year this time he looses weight as he runs more. When he was having trouble with his back joint (Roscoe is golden lab X german shepherd) I thought it was his arthritis kicking in as the vet said the last time he saw Roscoe. I was not worred when these things happened as the Vet told us when he last saw Roscoe ,these things were what the vet told me the last time. I just found out he has leukemia nd he only has a couple of days left. Find a Vet that you feel comfortable with and find our why otherwise you will have the heart break we are experiencing now