
We had this problem with our GR male, first I took him to the vet just to make sure there wasn't any underlying problem and he suggested putting him on Hill's ID, it's especially for gastric upsets, (very expensive but I think worth every penny) we tried him on that for about a week nothing else, no tit bits no nothing!! and he was much better after that we put him on Hill's sensitive stomach and now he is on Hill's Adult large breed plus tripe, chicken breast poached not roasted, he sometimes has the odd setback if he's stressed ie bitches in season, but it's 6 months and he is normal.I never give him schmacko's or anything similar, goes straight through him. that worked for us, good luck I know it is a worry.
Barbara