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Hi Heather, you’ve already done a lot of thoughtful work here. Since fresh blood and soft stool often point to large bowel inflammation, I would make sure parasite PCR testing and probiotic support are fully addressed first, just like Chris mentioned. In many young kittens, gut imbalance rather than true food allergy is the main trigger.
When it comes to diet, instead of eliminating everything on the bioresonance list, consider a structured diet trial with your vet using one novel protein at a time. A limited-ingredient, highly digestible formula is usually a better starting point than chasing every “sensitivity.” The best wet cat food in cases like this is typically a kitten-approved, single-protein recipe with minimal additives and no fillers, preservatives, or peas.
For dry food, you could ask your vet about a veterinary hydrolyzed kitten formula or a rabbit-based limited ingredient option for grazing. Some kittens do outgrow early GI sensitivities as their microbiome matures, especially with proper support and B12 if needed. The key is slow transitions, one change at a time, and giving each trial at least 4 to 6 weeks.