Best budget dog food for sensitive stomachs

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 point you in the right direction, it'd help to know a bit more: what breed and age is your dog, what symptoms are you seeing (loose stools, vomiting, gas, or something else), and what have they been eating so far?

That's really useful — constant gas with otherwise normal stools is a classic sign of ingredient sensitivity rather than a deeper gut problem, which is good news. Supermarket own-brand foods often contain a mix of grains, fillers, and multiple protein sources, and that combination is a common trigger for gassy dogs. Terrier crosses can be particularly reactive to cereals like wheat and maize. Given her age, you also want something that's gentle on digestion without being so low in nutrients that it lets an older dog down. Before I make a specific call — has she ever been on a food with a single protein source, or anything grain-free or limited ingredient?

That's fine — it actually makes the decision simpler. My honest recommendation for your situation is Harringtons Salmon & Potato Complete Dry Dog Food. It's a limited-ingredient recipe built around a single named protein (salmon) and an easy-to-digest carbohydrate (potato), with no wheat, no soy, and no artificial additives. Salmon is a good choice for gassy dogs because it's less likely to ferment in the gut the way beef or chicken-heavy foods can. It's a well-established UK brand, widely available on Amazon, and costs roughly £20–£25 for a 10kg bag — so genuinely affordable for daily feeding. It's not a boutique food, but the ingredient list is cleaner than most things at three times the price. Transition her slowly over about a week, mixing it with her current food, and you should see the gas reduce meaningfully within two to three weeks if diet is the cause.

Yes — a few things worth knowing. Go slowly with the transition: start with about 25% new food mixed into 75% old, and shift the ratio gradually over 7–10 days. Some loose stools in the first few days are normal as the gut adjusts; that's not a sign the food is wrong. If you see vomiting or the stools stay loose beyond day five, slow the transition down further. Also keep an eye on portion size — the Harringtons feeding guide tends to run a little generous, so weigh her food rather than guessing by eye, especially at eight years old when metabolism slows. If the gas hasn't improved meaningfully after four weeks on the new food, it's worth a vet check to rule out anything like small intestinal bacterial overgrowth, which needs a different approach.