Cavalier colitis & food intolerance advice

Chronic colitis with a suspected food intolerance link is actually one of the more manageable situations to tackle, especially when your vet is already on board — that's a real advantage. True food allergies in dogs are less common than intolerances, and for colitis in particular, the gut lining is often reacting to a protein it's been exposed to repeatedly over years. The gold standard next step is usually a strict elimination diet — either a novel protein your dog has never eaten before, or a hydrolysed protein food where the proteins are broken down too small to trigger a reaction. To point you in the right direction: how long has your Cavalier been showing symptoms, what food is he or she currently on, and has your vet suggested a specific protein to avoid or try?

Eight months of that is exhausting for both of you, and chicken is absolutely the most common culprit — she's likely built up a sensitivity to it over the years. Given your vet has specifically pointed you toward hydrolysed protein, you want to make sure you go with something genuinely hydrolysed rather than just 'sensitive' or 'single protein' foods, because those still contain intact proteins that can keep the reaction going. Can I ask — is she on any other foods, treats, chews, or flavoured supplements at the moment? Even a chicken-flavoured dental stick will undermine the whole elimination process.

That's actually a really common reason elimination diets fail, so it's great you've flagged it now rather than six weeks in. The cooked chicken especially needs to stop completely — even small amounts will keep the immune response ticking over and you won't see the gut settle. Dentastix will need to go too for now; once she's stable you can reintroduce a treat that matches her new diet. For the food itself, my clear recommendation is Royal Canin Veterinary Hypoallergenic. It uses hydrolysed soy protein and hydrolysed chicken liver at a molecular weight that's too small to trigger the typical immune response — so despite the chicken liver element, it's clinically designed not to cause the reaction a whole chicken protein would. It's the food most gastro vets reach for with exactly this presentation, it's highly digestible which helps an inflamed colon specifically, and Cavaliers tend to find it palatable. You'd need to do a strict 8–12 week trial with zero other food sources to get a clean result.

It's widely available on Amazon UK — the 14kg bag works out to a reasonable per-day cost for a Cavalier's portion size, and if it resolves the colitis you'll also be saving on vet visits and any medications she might be on for symptom management. One thing worth knowing: if after a clean 8-week trial her stools have normalised, you can then do a controlled rechallenge with chicken to confirm it was the culprit. If symptoms return, you have your answer and you keep her on the hydrolysed diet long term. If she doesn't respond to the hydrolysed food after 10–12 weeks of strict feeding, go back to your vet — at that point it may be inflammatory bowel disease rather than intolerance, which needs a different approach.

That's exactly the right move — starting tonight matters. Keep a simple diary of stool consistency from day one; it helps you and your vet see when things start to shift, and most dogs with food-triggered colitis show meaningful improvement within 3–4 weeks once the irritant is fully removed. Good luck to her — Cavaliers are usually brilliant patients once their gut is happy again.