About a month ago I switched my year old shepherd to Victor, and around that same time he started having issues with his butt. He had been constantly licking at it (it was red/inflamed) so we took him to the vet, he got an antibiotic and was good. Then he started developing diarrhea, he had always has a pretty sensitive stomach (and has had diarrhea before) but of course will eat anything. He is also very thin, that was the main reason we switched his food in the first place. Now, he's getting up to 6 cups of food a day but he still isn't gaining weight. His ribs are visible, when we went to the vet for his butt issue i mentioned his weight and they just said to up his intake of food (from 4 to 6 cups a day). He also, on top of everything, below his gums (on side of mouth) has small lesions and a bit of hair loss. So, we are planning on taking him in to the vet tomorrow and I hope they give more reasonable answers this time and do a stool test. I am thinking it may be a parasite or worms which would explain the diarrhea, and then the butt licking, and then his mouth being affected? If anyone has any ideas please let me know. Obviously we will still be going to the vet but I'm curious if anyone has had a similar experience.