Best dog food for itchy skin: what helps and how long it takes

The best food for an itchy dog is a complete recipe built around one named meat or fish, ideally with some oily fish in it, fed on its own for around eight weeks. Food isn't always the cause of the itch, though, so it's worth checking a few other things first.

Here's how to tell whether food might be behind the scratching, what to look for in a recipe, and how long to give it before you decide.

The short answer

Before changing food:

• Check for fleas, even if you can't see any.

• Look at the pattern. Is the itching all year round, or worse in spring and summer?

• Speak to your vet if the skin is broken, red, smelly, or losing hair.

When choosing a food, look for:

• One named protein, so you know exactly what your dog is eating.

• A protein your dog hasn't eaten much before.

• Oily fish or fish oil, which may help maintain healthier skin and coat over time.

• The word "complete", so it can be fed on its own.

• No extras during the trial, including treats and chews made from other proteins.

Is it the food? How often diet is to blame

Less often than many people think, but often enough to rule out. Across several studies, food was behind roughly one in five itchy dogs (Olivry & Mueller, 2017).

That means most itchy dogs are scratching for other reasons, such as:

• fleas or mites

• things in the environment, such as pollen, grasses, and house dust mites

• skin infections

• reactions to shampoos, cleaning sprays, or washing powder

So a change of food can help, but it works best alongside good flea control and a check-up with your vet.

How much scratching is too much?

All dogs scratch now and then. As a rough guide, it's worth speaking to your vet if your dog scratches or nibbles themselves regularly, more than four or five times a day, or if the scratching causes hair loss, soreness, wounds, or red skin (PDSA, 2020).

Other signs of an itchy dog include:

• licking or chewing their paws

• rubbing their face along the floor or furniture

• scooting or licking around their bottom

• repeat ear problems

An easy way to keep track is to give the itch a score out of 10 each evening. Over a few weeks, those scores will tell you far more than a general feeling that your dog "seems a bit better".

Clues that point towards food

None of these prove it's the food, but they're good reasons to try a food trial with your vet's help:

• Itching all year round, rather than mostly in the warmer months.

• Itching plus tummy trouble, such as loose stools or frequent wind.

• Itching that started or got worse after a change of food or new treats.

• Itching that keeps coming back despite regular flea treatment.

Why hair and saliva tests aren't worth it

You may have seen home tests that promise to find your dog's food triggers from a hair or saliva sample. Vets don't recommend them.

When two vets put one of these tests to the test, it reported food and environmental "triggers" for samples of fake fur from a child's costume and plain tap water. Results for real dogs were no better than chance (Coyner & Schick, 2019).

The method vets trust is a food trial, where your dog eats one carefully chosen food and nothing else for several weeks.

What to look for in a food for itchy skin

Whether you suspect a food sensitivity or a skin allergy, these are the things that matter most:

• One named protein. It's much easier to spot a trigger when there's only one meat or fish in the bowl.

• Something new to your dog. If your dog has eaten chicken for years, a chicken recipe can't rule chicken out. Choose a protein they haven't had much of before.

• Oily fish or fish oil. These provide omega-3, a type of healthy fat that may help maintain healthier skin and coat.

• A complete label. It needs to cover all your dog's needs on its own for the length of the trial.

• A short list of extras. Fewer different ingredients means fewer things to wonder about.

For help choosing a protein, our guides to what hypoallergenic dog food means and the best hypoallergenic dog food go into more detail.

How a food trial works, and how long to give it

1. Choose one complete food with a protein your dog hasn't eaten much before.

2. Switch over gradually across a week or two.

3. Feed only that food. No treats, chews, or table scraps unless they match the new protein.

4. Give it around eight weeks. In dogs whose itching was down to food, more than 95% had improved by eight weeks (Olivry, Mueller, & Prélaud, 2015).

5. Ask your vet about reintroducing the old food afterwards. If the itch comes back, you've found a likely trigger.

Skin takes longer to settle than tummies do. If your dog's main problem is loose stools rather than itching, our guide to the best dog food for a sensitive stomach explains why a shorter trial is often enough.

Can omega-3 help itchy skin?

It may help a little, but it isn't a quick fix. International guidelines from vet skin specialists say these healthy fats can bring a small improvement in itchy dogs and can improve the shine and quality of the coat. Any benefit may take around two months to show, and they won't calm a bad flare-up on their own (Olivry, DeBoer, et al., 2015).

The same guidelines note that foods with these fats built in tend to provide more of them than a separate supplement. That's one reason a recipe based on oily fish can be a sensible choice for an itchy dog.

When to see your vet

Book an appointment if your dog has:

• broken, red, or weeping skin

• hair loss or bald patches

• a smell from their skin or ears

• head shaking or sore ears

• itching that keeps them awake or stops them settling

Itchy dogs can be very uncomfortable, and your vet can help ease the itch quickly while you work out the cause together. Changing food is a longer-term step, not a replacement for that first check-up.

How AATU recipes fit

Our hypoallergenic dog food collection brings together recipes built around one named meat or fish:

• Salmon dry recipe: Salmon and Dried Salmon as the only protein, finished with salmon oil, a natural source of omega-3.

• Free Run Duck and Free Run Turkey: good options if your dog has mostly eaten chicken or beef before.

Each dry recipe is 80% Meat and Fish Ingredients and 20% Superfood Blend™, cooked using our Low and Slow™ method. Breed guides such as our Cocker Spaniel and Labradoodle guides cover skin and coat care for those breeds.

FAQs

What can I feed my dog to stop him itching?

There's no food that stops itching straight away. If food is part of the cause, a complete recipe with one protein your dog hasn't eaten much before, fed on its own for around eight weeks, is the best way to find out.

What do vets give dogs for itchy skin?

Vets have several options, including medicines that calm the itch, treatment for skin or ear infections, and flea treatment. Which one they choose depends on the cause, so it's worth booking a check-up before trying lots of things at home.

Can changing dog food cause itchy skin?

It can, if the new food contains something your dog reacts to. Itching can also start for other reasons around the same time, such as the change of season, so keep a note of both.

Is grain-free food better for itchy skin?

Not necessarily. Proteins such as beef, dairy, and chicken are more common triggers than grains. Our guide is grain free better for dogs? explains more.

Why is my dog itchy but has no fleas?

Fleas can be hard to spot, and even a few can set off an itchy dog, so regular flea treatment is still worth keeping up. Other common causes include pollen, dust mites, skin infections, and food.

Is salmon good for dogs with itchy skin?

Salmon is a natural source of omega-3, which may help maintain healthier skin and coat. It's a good choice for many itchy dogs, as long as they haven't eaten a lot of salmon before if you're running a food trial.