Best 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. Before I point you in a direction, it helps 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 you tried feeding them so far?

That makes a lot of sense — variable supermarket kibbles often swap ingredients batch to batch, which can really unsettle a sensitive stomach. Border Terriers aren't especially known for gut issues, so this is most likely a reaction to low-quality or inconsistent ingredients rather than a deep-seated intolerance. The good news is you don't need to cook anything. A few things are worth asking before I give you my best suggestion though: has Biscuit ever had a food with a single, clearly named protein source — like just chicken or just lamb? And has a vet ruled out anything like worms or giardia, given the loose stools have been ongoing?

Perfect — that's exactly what I needed to hear. My clear recommendation for Biscuit is Forthglade Complete Grain Free trays, in the chicken with sweet potato variety to start. Here's why it makes sense for your situation: each tray is a single named protein source with a short, readable ingredient list, which is the most reliable way to calm a sensitive stomach and figure out what he's actually reacting to. There are no grains, no mystery meat derivatives, and critically for you — you just peel back the lid and serve it. No prep, no measuring, no mess. They're sized well for a small dog like a Border Terrier, and you can buy them in multipacks on Amazon UK which keeps the cost down. Start with chicken, stick to it consistently for three to four weeks, and you should see the loose stools firm up and the gas reduce noticeably. If it doesn't improve at all after a month, that's when it's worth revisiting with a vet to look at intolerance testing.

Given he already has a sensitive stomach, a slow transition is worth doing even though it's a bit tedious. Spend about a week mixing the Forthglade in with his current kibble — start at roughly 25% Forthglade, increase to 50% by mid-week, then 75%, then fully over. It reduces the chance of a flare-up during the switch. For a 2-year-old Border Terrier at a healthy weight — usually around 5 to 7kg — you're looking at roughly one to one-and-a-half trays per day depending on his size and activity level. The Forthglade pack has a weight-based guide on the back which is easy to follow. Once he's fully transitioned, keep the food consistent and resist the urge to vary it — routine is your friend with a sensitive gut.

Good plan. Stick to the chicken variety for at least a month before considering any other flavours — you want a proper baseline. If the stools firm up and the gas settles, you'll know you're on the right track. If things don't improve after four weeks of consistent feeding, it's worth booking a vet appointment to explore whether there's a specific intolerance at play. Good luck with Biscuit — Border Terriers are tough little dogs, and getting the diet right usually makes a big difference quickly.