Sensitive Boxer tried everything — what works

A dog that reacts differently to every format — raw, kibble, wet — is actually telling you something useful: the issue probably isn't one single ingredient, it's more likely a combination of digestive sensitivity and an immune system that's become reactive over time. Sensitive stomach issues in dogs usually fall into a few categories — food intolerance, ingredient sensitivity, or a gut that just needs a simpler diet — and identifying which applies is the key to finding the right food. To get specific with you: what breed and age is your dog, what symptoms are you seeing with each food type, and what did you actually try? One short paragraph is fine — the more detail the better.

That pattern is really informative. Liquid stools on raw usually points to too much fat or rich protein hitting an underprepared gut. The gas and bloating on kibble is often fermentation in the large intestine — typically from legumes or certain fibres that are common in grain-free formulas. And vomiting after wet food often means either the food is too rich, too fast to digest, or there's a specific protein he can't tolerate. Before I suggest anything — what proteins has he been exposed to across all those diets? Chicken, beef, lamb? And has a vet ruled out anything structural, like IBD or EPI?

That's the key piece. He's been sensitised to your three most common proteins. What you need now is a genuine novel protein — something his immune system hasn't built a response to — in a simple, highly digestible format with minimal added ingredients. No legumes, no rich fats, no long ingredient lists. I'd point you toward Canagan Grain Free Countryside Feast, which uses free-run turkey as the primary protein. Turkey is still relatively uncommon in mainstream dog food and a lot of dogs with multi-protein sensitivity do well on it. Canagan also avoids the pea and lentil heavy base that causes the fermentation issues you saw with kibble — they use sweet potato instead, which is much gentler. The fat content is moderate and the protein sources are clearly labelled, so if he does react you'll know exactly what to look at. It's a kibble, which I know hasn't worked before, but the previous kibble's legume base was likely the real culprit, not the format itself. I'd transition very slowly — two weeks minimum — mixing in just 20% new food to start.

Canagan does make a wet range and the Countryside Feast wet version uses the same turkey base, so it's a clean pairing if you want to mix or transition. Mixing a small amount of wet with the kibble can also slow down fast eaters — Boxers often bolt their food, which contributes to bloating and vomiting independently of the food itself. On top of that, I'd genuinely recommend adding a canine-specific probiotic for the first 4–6 weeks. YuMOVE Digestive Care is a solid, well-evidenced option that helps rebalance gut flora after a period of dietary disruption. It won't mask a real intolerance but it does help the gut adapt more smoothly. The combination of a novel protein, cleaner carb source, and supported gut flora gives you the best shot at finally getting a stable baseline.

Good plan. Keep a simple food diary for the first month — just note the symptoms, stool consistency, and anything that changes. If he's still having issues after a full 4-week transition on a clean novel protein, that's the point to go back to the vet and discuss a hydrolysed protein diet, where the proteins are broken down to a size the immune system can't react to. But try the Canagan turkey route first — a lot of dogs in exactly this situation stabilise well on it. Good luck with him.