Sensitive stomach in dogs: causes and what to feed

Quick answer: A dog with a sensitive stomach usually does best on a complete, highly digestible food with moderate fat and the right amount of fibre, fed in measured meals with no rich extras. Change foods slowly over 7 to 10 days. If the upset keeps coming back, or your dog is losing weight, has blood in the stool or seems unwell, see your vet before trying more foods.

Loose stools, wind, gurgling tummies and the odd vomit are some of the most common reasons owners start looking at a new dog food. Sometimes food is the cause, sometimes it isn’t. This guide explains what a “sensitive stomach” can mean, what to look for in a food, and when it’s time to involve your vet.

Signs of a sensitive stomach

The American Kennel Club lists these as common signs of tummy trouble in dogs:

• Soft stools or diarrhoea
• Excess wind or loud tummy noises
• Occasional vomiting, retching or regurgitation
• Straining to pass stool
• Drooling, lip licking or licking floors and surfaces
• A picky or poor appetite, restlessness or low energy

What can cause it

“Sensitive stomach” isn’t a diagnosis. It describes symptoms that can have very different causes, and only some of them are about the food in the bowl:

• Rich or fatty extras: table scraps, braai leftovers and fatty treats are common triggers, and very fatty food can also lead to pancreatitis.
• Sudden food changes: switching foods overnight often causes a few days of upset.
• Food intolerance or allergy: some dogs react to a particular ingredient, often a common protein such as chicken, beef or fish.
• Stress: travel, boarding or changes at home can cause “stress colitis”.
• Parasites and infections: worms and other parasites, and viruses such as parvovirus, which is why deworming and vaccination matter.
• Ongoing gut disease: conditions such as inflammatory bowel disease need a vet to diagnose, sometimes with blood tests, scans or biopsies.

Because the causes overlap, the right food helps many dogs but can’t fix everything. If changing food doesn’t settle things within a few weeks, the cause is probably something else.

What to look for in a food for a sensitive stomach

1. Complete, balanced and highly digestible

Start with a food labelled complete for your dog’s life stage. Then look for one designed to be highly digestible. The UC Davis veterinary nutrition team explains that highly digestible diets are absorbed more completely, so less undigested food travels further down the gut, where it can cause wind and loose stools. Foods sold as “sensitive digestion”, “digestive care” or “sensitive stomach” are usually made with this in mind.

2. Moderate fat

Fat slows down how quickly the stomach empties, and in dogs with weaker digestion extra fat can make diarrhoea worse. A food with moderate fat is a sensible choice for most sensitive dogs. Check the fat percentage in the guaranteed analysis on the bag and compare foods side by side.

3. The right fibre

Fibre feeds healthy gut bacteria and helps firm up stools. Sources such as beet pulp, psyllium, inulin and pumpkin are common in digestive-care foods. More isn’t always better, though: UC Davis notes that dogs respond to fibre very differently, and too much can cause constipation or diarrhoea. If your dog has an ongoing problem, let your vet guide fibre changes.

4. A protein your dog tolerates

If you suspect a reaction to a particular protein, a food built around a different single protein (such as lamb, salmon or duck) is worth discussing with your vet. Keep in mind that no food is “hypoallergenic” for every dog. What matters is what your dog has eaten before.

5. Don’t assume grain-free is gentler

Grains are rarely the problem. The AKC notes that grain-free foods are often lower in fibre, which can work against a sensitive gut, so they aren’t automatically the better choice for tummy trouble.

Habits that help as much as the food

• Switch slowly. Start with about 80 to 90% old food and 10 to 20% new food, and increase the new food gradually over 7 to 10 days. Go slower if stools soften.
• Stick to one food. Rotating flavours or brands makes it hard to tell what’s working.
• Measure meals. Overfeeding alone can cause loose stools. Two or more measured meals a day are usually easier on the gut than one big one.
• Cut the extras. Table scraps, fatty treats and chews are often the real cause. Keep treats to no more than about 10% of daily calories.
• Don’t add supplements to a complete food unless your vet recommends them.
• Keep up deworming as your vet advises.

If you suspect a food allergy

The only reliable way to confirm a food allergy is an elimination diet trial, done with your vet. Your dog eats one carefully chosen diet, usually a hydrolysed-protein or novel-protein food, and nothing else for at least 12 weeks. That means no treats, table food or flavoured chewable medicines. If symptoms clear, the old food is reintroduced to confirm the cause.

Over-the-counter “limited ingredient” foods aren’t a substitute for a proper trial, as veterinary dermatologists warn that commercial foods can be cross-contaminated with other proteins during manufacturing.

When to see your vet

Don’t keep changing foods if your dog has any of the following. See your vet instead, and urgently if your dog is a puppy, a senior or seems unwell:

• Vomiting or diarrhoea that lasts more than a day or two, or keeps coming back
• Blood in the stool or vomit, or black, tarry stools
• Weight loss, or a change in appetite or thirst
• Lethargy, a painful or bloated tummy, or signs of dehydration
• Repeated retching without bringing anything up, which can be an emergency in large, deep-chested dogs

Your sensitive stomach checklist

• Your vet has ruled out parasites and illness if the problem is ongoing.
• The food is complete for your dog’s life stage and made to be highly digestible.
• Fat is moderate, and the fibre level suits your dog.
• You switch over 7 to 10 days and then stick to one food.
• Meals are measured, and treats stay under about 10% of daily calories.
• You give a new food a few weeks before judging it, unless symptoms get worse.

Where to start

Our sensitive stomach dog food page brings together digestive-care formulas from trusted brands in one place. For puppies, read our guide on how to choose puppy food, or browse all dog food.

Once you find a food that agrees with your dog, sticking with it matters. Autoship makes sure you never run out, with 35% off your first order (up to R400) and 5% off after that. Not sure which food fits? Chat to us on WhatsApp or email hello@zuki.co.za.

This guide is general information, not a substitute for veterinary advice. If your dog has ongoing tummy trouble, speak to your vet.

Frequently asked questions

Sources

• American Kennel Club: Best dog food for sensitive stomachs
• UC Davis School of Veterinary Medicine (Fascetti & Delaney): Nutritional management of gastrointestinal disease
• dvm360 (Rosser, DACVD): Diagnosis and treatment of food allergy in dogs
• WSAVA Global Nutrition Committee: Guidelines on selecting pet foods