ECID, Fancy Feast is one of the only foods Tucker can eat, as long as it's the gluten free varieties. Beef doesn't always do well with him. The chicken and salmon ones he's never had a problem with.
FortiFlora worked great for getting him to eat, but it didn't help his belly much. I also added pumpkin, but I'm wondering if for Mickey if we start from scratch, plain chicken and rice maybe his belly can rest. The B12, are you giving it or going to the vet? Just want to make sure it's B12 and not complex, I've found the B12 helps Tucker, he's also getting it once per week. It's pink in color.
Drontal, is that the dewormer? You might want to mention it to your vet just to be sure it's okay to use, I don't want to hurt sweet Mickey.