backinit Varitek has colon issues and at one point it just exploded in the house. A mess like you had. With him he had trouble going, had to go to an emergency vet a few times and they wanted to do surgery. He had a “pocket” in his colon. Anyway, the breeder suggested Mirralax with every meal and he has been great, soft poop but no issues.
Ozzy has a bad stomach… weird poop with blood etc…. Switched him to Purina Pro plan sensitive stomach Salmon and he has had zero issues.