I was talking with my regular vet recently and she's found a definite correlation between Mast Cell Cancers and diarrhea. She's not holistic at all so I was telling her about Floyd's surrogate allergy testing, where he strongly tested allergic to shellfish. A. The dog is allergic and B., may or may not develop MCT, and/or gastric problems.
At the time of the testing, I'm thinking, "Wait, I don't give him shellfish", but of course I did. Glucosamine. Even most supplements for digestion contain shellfish. By the time I did true elimination diets, his system was so upset that he didn't respond. It took months of medication (Tylan) before it finally got better and even then, diet was somewhat limited. Natural Balance with a cooked topper worked best.
My SIL recently lost a six year old Boxer, who was well bred, to MCT