Feeding & Nutrition

You can spot these owners in the pet shop. They are the ones reading the ingredient panel on the back of the bag with the intensity of someone defusing a device, because they have been through six foods this year and their dog still produces something unspeakable in the garden every morning.

Chronic digestive upset is exhausting. It is also, in a lot of cases, fixable, but usually not by the route most people try first, which is buying yet another bag of something premium and hoping.

First, rule out the things that are not diet

Before you spend three months on food trials, get the medical causes off the table. Persistent diarrhoea or vomiting can come from intestinal parasites, and a proper faecal test is cheap. Giardia in particular causes chronic soft stools and is missed on single samples, so a three-day pooled sample is better.

Other causes worth excluding include exocrine pancreatic insufficiency, where the pancreas fails to produce digestive enzymes and the dog passes large volumes of pale greasy stool while losing weight despite a huge appetite. Inflammatory bowel disease, chronic pancreatitis, Addison's disease and thyroid problems all present with digestive signs. In young dogs, dietary indiscretion, meaning eating rubbish on walks, causes more upsets than any food sensitivity.

Red flags that mean go to the vet rather than change the food: blood in the stool, black tarry stool, weight loss, vomiting more than occasionally, lethargy, a painful abdomen, or diarrhoea lasting more than 48 hours.

Understanding what sensitive actually means

The term gets used loosely on packaging and means almost nothing legally. In practice, dogs labelled sensitive fall into a few groups.

Some have a genuine food allergy, an immune reaction usually to a protein. Beef, dairy, chicken and wheat are the most commonly implicated, mostly because they are the most commonly fed. True allergy often involves itchy skin and ears as much as gut signs.

Some have a food intolerance, which is not immune-mediated. The dog simply cannot digest something well, and lactose is the classic example.

Many, perhaps most, have neither. They have a gut that responds badly to high fat, sudden changes, overfeeding, rich treats, or too little dietary fibre. These dogs do not need an exotic protein. They need consistency and the right fat and fibre balance.

The elimination diet, done properly

If you suspect a genuine food reaction, the only reliable test is an elimination trial. Blood and saliva allergy tests for food are widely sold and, according to current evidence, not reliable.

The method is straightforward but demands discipline. Choose either a novel protein the dog has never eaten, such as venison, rabbit, duck or kangaroo depending on what is available and what the dog has had before, or a hydrolysed diet where proteins are broken into fragments too small for the immune system to recognise. Hydrolysed veterinary diets are generally the more reliable option.

Then feed that and nothing else for eight to twelve weeks. Nothing else means nothing. No flavoured chews, no dental sticks, no table scraps, no flavoured medication or supplements, no licking the toddler's plate. One rogue chicken treat resets the clock, and this is the reason most home trials fail.

If signs improve, you then reintroduce single ingredients one at a time for a week or two each to identify the culprit. Many owners skip this because they are so relieved, but knowing the trigger gives you much more freedom afterwards.

The unglamorous fixes that work more often

Slow down transitions. Switching foods over seven to ten days, increasing the new food by roughly ten percent per day, prevents most food-change diarrhoea. Dogs with sensitive guts sometimes need two or three weeks.

Lower the fat. High-fat diets are a common and underappreciated cause of loose stools and are a serious problem for dogs prone to pancreatitis. Look for a food with moderate fat, and cut out the fatty treats. Many dogs improve on this alone.

Get the fibre right. Fibre is the most useful tool in the box and the least discussed. Soluble fibre such as psyllium absorbs water and firms loose stool while feeding beneficial bacteria. Plain canned pumpkin, in a tablespoon or two for a medium dog, is the household staple. Some dogs respond dramatically to a higher-fibre diet.

Split the meals. Two or three smaller meals put less load on the digestive system than one large one, and they reduce the bile-related vomiting that causes early morning yellow foam.

Measure the food. Overfeeding is a leading cause of soft stool, and a great many dogs described as sensitive are simply eating twenty percent more than they need.

Probiotics, and what they can and cannot do

Veterinary probiotics with documented strains and reliable colony counts help in specific situations: recovery after antibiotics, acute stress-related diarrhoea, and some chronic cases. Enterococcus faecium and certain Bifidobacterium strains have supporting evidence in dogs.

Human yoghurt is a poor substitute. The strains are chosen for human guts, the counts are low, and the lactose can make things worse.

Prebiotics, the fibres that feed existing gut bacteria, are arguably as useful and are already present in good sensitive-stomach diets in the form of beet pulp, chicory root or inulin.

Give any probiotic a fair trial of three to four weeks before deciding, and stop if there is no change rather than adding it to a growing pile of supplements.

The bland diet myth and what to do in a flare

Boiled chicken and rice is the traditional response to an upset stomach, and it is fine for a couple of days. What it is not is a long-term diet, because it is nutritionally incomplete and deficient in several essentials within weeks.

For a mild acute flare in an otherwise well dog: withhold food for eight to twelve hours in adults, never in puppies, then offer small frequent portions of something bland for two days, then transition back to the normal diet over three or four days. Keep water available throughout. Veterinary gastrointestinal recovery diets do this job better than home cooking.

Keep a record

The owners who solve this are almost always the ones who wrote it down. Food, amount, treats, stool quality on a simple one to seven scale, and any symptoms. Patterns show up in a few weeks that were invisible day to day, and it turns a vague complaint into something your vet can actually work with.

Sensitive digestion is rarely mysterious once you stop changing three variables at a time.