I had the same problem with my Rosco. He was perfectly fine except for his bowel movements. Very muscusy poops and the smell
. He has been on antibotics twice. It helped but the problem kept coming back. Thanks to a YT member Dwerten
helped me out. Come to find out I was feeding Rosco boiled chicken alot and his dry food had chicken and pot. in it. His tummy can't handle chicken. Thats why he had bad poops. I took him off of chicken and he is doing much better. Sounds like there is a food his tummy can't handle. What does he eat alot of? Take it out of his diet and see if he gets any better.