Have you tried Royal Canin Hepatic 14? Homecooking? A lot of liver and GI pups benefit if nothing else is working. For intestines - if the tylan is necessary, it's probably not the worst thing in the world. Sometimes switching out protein and carbs sources can help with intestinal problems.
Some of us really like Purina HA for dogs with liver and intestinal issues. It's low protein while being the correct kind. It's low fat. It's a novel protein for most dogs. But it is very low fiber. Some IBD dogs do well on low fiber and some need higher fiber. If that's the case then sometimes can be added to it to help with that.
BTW, when my dog needed fiber added in, her nutritionist was going to have me try metamucil AFTER trying sweet potato and pumpkin. So I think you do have other options. But if it's a clostridium problem, changing fiber % may not do a thing.
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