Dull coat after switching to grain-free dog food

A dull coat appearing shortly after switching to grain-free is actually a pretty common pattern — it usually points to a change in fatty acid balance rather than a true food allergy. True allergies are less common than people think; what you're more likely seeing is a nutritional gap introduced by the new food. The most effective fix for genuine allergies is an elimination diet using a novel or hydrolysed protein, but a coat change like this often has a simpler cause. To point you in the right direction: what breed and age is your dog, what symptoms are you seeing beyond the coat, and have you spoken to a vet or tried anything so far?

That's really useful — no itching and no gut issues makes a food allergy much less likely. What you're describing sounds like the new grain-free formula is lower in omega-3 and omega-6 fatty acids than what he was eating before. Flat-Coated Retrievers have a dense, glossy double coat that's quite sensitive to changes in dietary fat quality. Can you tell me what grain-free food you switched him to, and roughly what the previous food was? That'll help me see exactly where the gap might be.

That explains it neatly. Many supermarket own-brand grain-free foods use chicken as the sole protein and don't compensate with added omega oils — Harrington's actually has a decent fatty acid profile for the price, so moving away from it without replacing that fat quality would cause exactly what you're seeing. The fix here isn't necessarily avoiding grain-free, it's finding a grain-free food that's genuinely rich in omega-3. I'd switch him to Forthglade Complete Grain Free Adult with Salmon — it's widely available on Amazon UK, uses salmon as the primary protein which is naturally high in EPA and DHA, and it's a cold-pressed style wet tray format with a clean ingredient list. For a 6-year-old FCR you'd be looking at the adult range. Most owners with similar coat complaints see a noticeable difference within four to six weeks of switching.

Let the food do the work first — adding a supplement while switching makes it harder to know what's actually helping, and Forthglade's salmon recipe genuinely has enough omega-3 that you shouldn't need to stack anything on top. If his coat hasn't improved after six weeks on the new food, then adding a small amount of cold-pressed salmon oil would be the next logical step. But I'd bet you won't need to get there. Make the switch gradually over about ten days to avoid any digestive upset even though he hasn't had gut issues — it's still worth doing slowly.

You're in good shape — this is a straightforward fix. Forthglade Complete Grain Free with Salmon, slow transition over ten days, and reassess the coat at the six-week mark. If anything else changes or the coat doesn't come back, that would be the time to loop in your vet. Good luck with him.