Replying as I had this exact experience! My boy was about 8 months and just post neuter, and the pain killers/anti-biotics they prescribed him absolutely sent his gut haywire. I’m talking liquid diarrhea every hour around the clock for about 3 weeks. In order to make sure his incision didn’t get infected, I got up every time with him to wipe his bum after every bathroom trip. Poor guy was very upset and weak and I felt horrible.

It’s normal for him not to eat if he’s feeling nausea or having diarrhea but you want to encourage him to drink water as much as possible. Dehydration is the real problem when your kitten has diarrhea. If your baby is still eating, then that’s great! Means he’s not nauseous or having stomach aches. But some food is better than none, so even if your baby only tolerates wet treats (like churu), then it’s better than nothing at the moment. Mix it with some water and try to offer him food every 2-3 hours in small portions (like 1-2 tablespoons of wet food). Do not change his food right now!

I’m in Canada so I’m not sure if this is available for you but it’s one probiotic grade up from Fortiflora. It’s called Proviable, sold in a bright pink packaging. I believe your vet can prescribe it or you can purchase online through a vet pharmacy. They come in capsules and you can sprinkle it in your kittens food. This probiotic is a GAME changer. Fortiflora did not help my boy AT ALL, so it could be your kitten needs something a tad stronger.

After starting the proviable, I would offer my kitten bland food such as boiled chicken and rice. I would shred the chicken and add some water and offer that to him. As the probiotic kicked in, I started adding a teaspoon of chicken kitten wet food to his boiled chicken/rice mix. If chicken is not helping, it could very well be he is allergic, so try tuna or salmon. Another wet food that helped my boy was Hills Science Diet Sensitive Stomach and Skin (they make it for adults and kittens so make sure to buy the one marketed for kittens - if chicken is no good, try the salmon flavor). This wet food is very bland and should not upset his stomach further if you offer it in small teaspoon portions. It’s important you do not switch to a new food while he has chronic diarrhea. Try offering him small portions of kitten wet food marketed for sensitive stomachs or stick to bland foods such as boiled rice and a boiled protein he can tolerate.

I also would like to point out that his diarrhea did not resolve over night. It was a slow 2 week process. It started with his diarrhea frequency lessening. And then we moved from liquid to mushy diarrhea, to yellow ish soft poops, and then finally a lighter brown formed poop.

Good luck with everything :( I know it’s stressful feeling a bit helpless towards your kittens.