Short answer: an elimination diet trial means feeding your dog one carefully chosen diet, with nothing else, for around eight weeks, then reintroducing the old food to see if symptoms return. It is the most reliable way to confirm a food allergy in dogs. It should be planned with your vet, who will help choose the trial diet and rule out other causes of itching first.

Itchy skin, paw licking, ear infections and recurring tummy trouble send many owners searching for a "hypoallergenic" food. Switching foods every few weeks rarely answers the question. A proper trial does.

Step zero: rule out the other causes

Food is only one possible cause of itching, and not the most common one. Fleas, mites, skin infections and environmental allergies to things like dust mites and pollen are all frequent causes. Your vet will usually check for and treat these first. If parasites or infection are driving the itch, no diet change will fix it.

How a trial works

1. Choose the trial diet with your vet

The aim is a diet your dog's immune system has not seen before, or one where the proteins are broken down so small the body is unlikely to react. Vets typically use one of two approaches:

• A novel protein diet: protein sources your dog has never eaten.
• A hydrolysed protein diet: usually a prescription food in which the proteins have been broken down.

A plant-based food can work as a novel protein option for some dogs, because it removes all animal proteins, which are among the most commonly reported triggers. V-Planet's proteins come from peas, potato, lentils, quinoa and yeast, with no animal products, corn, wheat or soy. But it is only "novel" if your dog has not eaten those ingredients before, and many dog foods now contain peas or potato. Your vet may prefer a prescription diet for the strictest trials. Bring the full ingredient list to your appointment so you can decide together.

2. Transition, then feed only the trial diet

Move onto the trial food gradually over about a week to avoid stomach upset. From then on, the trial diet and water are the only things your dog eats.

3. Be patient

Skin cells take weeks to renew, so improvements are slow. Many vets recommend around eight weeks, sometimes longer. Digestive symptoms may improve sooner. Keep a weekly diary of itching, licking, ear problems and stool quality, with photos of any problem areas.

4. Rechallenge to confirm

If symptoms improve, your vet may suggest reintroducing the old food. If the itch returns within days to a couple of weeks, food allergy is very likely. This step feels counterintuitive when your dog is finally comfortable, but it is the only way to be confident. Your vet may then guide you through adding single ingredients back to pinpoint the trigger.

The mistakes that ruin trials

• Treats and chews. One flavoured chew can undo weeks of effort. Use pieces of the trial kibble as rewards.
• Flavoured medicines and supplements. Some chewable tablets and parasite treatments are flavoured with animal proteins. Ask your vet about alternatives.
• Table scraps and family members. Everyone in the household needs to know the rules, including visitors and helpers.
• Scavenging. Food picked up on walks or from other pets' bowls counts.
• Stopping too soon. Judging the result after two or three weeks often leads to the wrong conclusion.
• Changing several things at once. New shampoos, supplements or medications during a trial make results hard to read.

What about allergy tests?

Blood, saliva and hair tests marketed for diagnosing food allergies in dogs are not considered reliable by most veterinary dermatologists. An elimination trial remains the standard approach. Intradermal and blood tests can be useful for environmental allergies, which your vet may investigate separately.

What success looks like

A good trial result might mean less scratching, fewer ear flare-ups, calmer paws and firmer stools. It will not always mean zero symptoms, because many dogs have more than one type of allergy. If the food helps partly, that is still useful information for your vet.

For more background, read our guides on dog food allergy signs and triggers and the best dog food for allergies in the UAE.

After the trial

If your dog does well on the trial diet and your vet is happy, many owners simply stay on it long term, provided it is complete and balanced for the dog's life stage. V-Planet is formulated to AAFCO standards for adult dogs, so it can be fed as a full diet rather than a temporary measure. Keep treats consistent with the diet, and keep your vet in the loop if symptoms return.

Frequently asked questions

How long should an elimination diet trial last?

Many vets recommend around eight weeks, sometimes longer, because skin takes time to renew. Digestive signs may improve sooner. Follow your vet's guidance.

Can I give treats during an elimination trial?

Only treats made from the trial diet itself, such as pieces of the same kibble. Other treats, chews and flavoured medicines can invalidate the trial.

Can vegan dog food be used for an elimination trial?

It can for some dogs, because it removes all animal proteins. It only counts as novel if your dog has not eaten its plant proteins before. Decide with your vet.

Are allergy blood tests reliable for food allergies in dogs?

Most veterinary dermatologists do not consider blood, saliva or hair tests reliable for diagnosing food allergies. An elimination trial is the standard method.

What if my dog is still itchy after the trial?

Food may not be the main cause, or your dog may have more than one type of allergy. Your vet can investigate environmental allergies, parasites and infections.