Although a lot of US vets push Hills aggressively, I do not like the brand or ingredients used and I would never feed it to my cats under any conditions. I have no experience with Ziwi Peak of any formula. My cats have done well over years on Blue Buffalo different formulas and Soulistic different formulas. These are available through Petco.com if you are able to access and are interested. They are not special health formulas but rather high-quality diets.When we first had him he had horrible diarrhea on Hills I/D and still diarrhea and puddles with Hills Z/D. He’s been fully transitioned now to Ziwi Peak Rabbit+Lamb and we haven’t had any diarrhea since. But the poops are rather long in size, and they’re formed which is great but can still be on the softer side from time to time.
I do not know what is causing Luci's complaints but I continue to pray for him and think the best thoughts of wellbeing for him. Thank you so much for following up with his vet!