Janet, the best thing I have used to firm up stools is ground beef and All Bran Cereal. Brown the ground beef, drain well, mix in All Bran. Give a few handfuls throughout the day. Next day add in some kibble. Continue until the beef/All Bran mixture is gone and he is just eating kibble.
My dog was allergic to chicken, so chicken and rice helped nothing. My old vet told me about the beef and All Bran. He was a shepherd guy. I have used this with other breed dogs and am currently using it with my new GSD foster.
If the stool gets soft again, start using the mixture again. I also add a tablespoon of pumpkin to each meal.
Natty Boh 6-27-12
Annie 1998 - 8-2-12 RIP