The short answer
Feed a Westie a complete small-breed diet from a nutritionist-backed brand, and do not expect food to cure the itch. West Highland White Terriers are one of the most allergy-prone breeds, but the itch is usually environmental, not dietary, so a food change often does nothing. Two things most guides miss are worth knowing: the breed can have a copper-related liver tendency that makes a reputable food and prompt vet care matter, and a juvenile jaw condition can make eating briefly painful. Keep the dog lean, skip grain-free unless your vet advises it, and treat persistent itch as a vet problem.
Why food rarely fixes the famous Westie itch
If you own a Westie, you have probably already changed foods chasing the itch, and you may have been disappointed. There is a reason for that.
West Highland White Terriers are one of the most atopy-prone breeds in the world. Atopic dermatitis is an allergy to environmental things like pollen, grass, dust mites, and mould, and it is far more common in the breed than a true food allergy. UFAW documents how strongly the breed is predisposed to it. So when you switch food and nothing changes, it is usually because the food was never the trigger.
A useful clue: environmental itch is often seasonal, flaring in spring and summer, while a food-allergy itch tends to run all year. The only reliable way to confirm a food allergy is a vet-run elimination diet, eight to twelve weeks on a single novel or hydrolyzed protein with no other treats, then a rechallenge. Blood and saliva allergy tests are not reliable for food allergy. PetMD's overview of dog skin allergies walks through the order of likelihood. The honest takeaway: a Westie's itch is a vet conversation, and omega-3 fish oil to support the skin barrier is far more likely to help than another bag.
The copper-liver angle most guides skip
A copper-restricted diet is only for a Westie diagnosed with copper-associated liver disease by a vet. Never put a healthy dog on a low-copper diet to be safe, and never add copper supplements to a Westie without veterinary advice.
This is the part almost no Westie feeding article covers. The breed can carry a tendency to accumulate too much copper in the liver, a condition called copper-associated hepatopathy that can damage the liver over time. Cornell's Riney Canine Health Center explains how diet fits into managing it.
For a dog actually diagnosed with the condition, vets often prescribe a copper-restricted therapeutic diet as part of treatment. For a healthy Westie, the practical takeaway is simpler: choose a reputable, nutritionist-backed food rather than a boutique product with unverified mineral levels, and take any signs of liver trouble (poor appetite, vomiting, lethargy, yellowing of the gums or eyes) to your vet without delay. It is one more reason the brand behind the food matters.
Westie jaw, and how much to feed
One puppy-stage issue is worth knowing because it directly affects eating. Craniomandibular osteopathy, often called Westie jaw or lion jaw, is a juvenile bone condition the breed is prone to, usually appearing between about three and eight months. It causes painful swelling of the jaw bones that can make chewing hurt, and it typically settles as the puppy matures. It is not caused by diet, but softened or moistened food makes a painful phase easier to get through. Any puppy that is reluctant to eat or seems to have a sore jaw needs a vet.
For day-to-day feeding, feed to body condition, not the chart. Most adult Westies (around 15 to 20 pounds) do well on roughly half a cup to one cup of quality food a day split into two meals, scaled to size and activity. Feel the ribs, look for a waist, and count treats inside the daily total. Small breeds put on weight quietly, and the extra pounds strain joints and worsen the dental disease small dogs are already prone to.
Grain-free and foods to avoid
Skip grain-free unless your vet diagnoses a grain allergy. Grains are almost never the cause of the itch, and the FDA grain-free investigation is a real reason for caution.
Keep these away from a Westie completely: chocolate, grapes and raisins, xylitol (in gum and some peanut butters), onions and garlic, macadamia nuts, alcohol, caffeine, and cooked bones. For a curious small terrier that will scavenge, keep human food and the trash well out of reach. If your dog eats something toxic, call your vet or a pet poison helpline right away.
Looking to adopt a Westie?
Plan for itchy-skin checks and a vet relationship before day one. Browse West Highland White Terriers and terrier mixes available now from the rescues we track.
See Available Westies →Where to buy Westie food
Every brand worth feeding a Westie is easy to find in store and online:
- Pet specialty chains (Pet Planet, Tail Blazers, Tisol, and similar). Carry Royal Canin, Pro Plan, and sensitive-skin lines.
- Pet Valu and PetSmart. National chains that stock the major small-breed and sensitive-skin formulas.
- Your vet clinic. The place for prescription hydrolyzed diets used in allergy work-ups and any copper-restricted therapeutic diet.
- Online. The same brands ship to your door, easy to set on a recurring delivery.
A skin-supporting supplement helps more than most food swaps for this breed. A quality omega-3 fish oil for dogs is an easy, evidence-supported add-on, ideally cleared with your vet.
Gear we’d set up for a Westie
The essentials for a bold, busy little terrier, from a no-pull harness to a chew toy and a flirt pole.
Escape-Proof No-Pull Harness
Gentle control on the first walks — built so a spooked dog can't back out of it.
View on Amazon →
Indestructible Chew Toy
Built for power chewers — survives the jaws that shred normal toys.
View on Amazon →
Flirt Pole
Ten minutes drains more energy than a long walk — channels prey drive.
View on Amazon →
Orthopedic Dog Bed
A supportive memory-foam bed for tired joints — and it fits right inside the crate.
View on Amazon →
Enzyme Stain & Odour Remover
The first few weeks come with accidents — get the smell gone, not masked.
View on Amazon →Amazon affiliate links — we earn a small commission at no extra cost to you, which helps keep LocalPetFinder free and more rescue dogs finding homes. See all our gear picks →
Frequently Asked Questions
What is the best food for a West Highland White Terrier?
A complete small-breed formula from a brand that employs a board-certified veterinary nutritionist and runs feeding trials, like Royal Canin, Hill’s Science Diet, or Purina Pro Plan. Westies are famously itchy, so a sensitive-skin or limited-ingredient line is a common starting point, but most of the itch is not actually caused by food, so do not assume a new bag is the answer. Start with what the breeder or rescue fed, transition over seven to ten days, and judge the food by firm stool, a settled coat, and a lean body, not by the marketing.
My Westie is so itchy. Will changing food fix it?
Usually not, and this is the most important thing to understand about the breed. West Highland White Terriers are one of the most atopy-prone breeds there is, meaning they react to environmental things like pollen, grass, and dust mites, and that kind of allergy is far more common than a true food allergy. A clue: environmental itch is often seasonal, while food-allergy itch tends to be year-round. So a food change frequently does nothing. If your vet does suspect food, the only reliable way to confirm it is an eight to twelve week elimination diet on a single novel or hydrolyzed protein, not a blood or saliva test. Persistent itch needs a vet, not a parade of bags.
What is copper-associated liver disease, and does diet matter?
It is a real, breed-associated concern that almost no feeding guide mentions. West Highland White Terriers can carry a tendency to accumulate too much copper in the liver, which over time can damage it. In a dog actually diagnosed with copper-associated hepatopathy, vets sometimes prescribe a copper-restricted diet as part of treatment, and they may caution against copper-heavy supplements. This is strictly vet-directed: a healthy Westie does not need a low-copper diet, and you should never put a dog on one to be safe. But it is a good reason to choose a reputable, nutritionist-backed food and to take any sign of liver trouble to your vet promptly.
My Westie puppy seems to have a painful jaw and won’t eat well. What is that?
It could be craniomandibular osteopathy, sometimes called Westie jaw or lion jaw, a juvenile bone condition the breed is prone to that usually shows up between about three and eight months. It causes painful swelling of the jaw bones, which can make chewing and eating genuinely hurt, and the condition typically settles as the puppy matures. This is not caused by diet, but diet can help you manage a painful phase: softened or moistened food is easier to eat during a flare. Any puppy that is reluctant to eat or seems to have jaw pain needs a vet, both to diagnose it and to manage the discomfort.
How much should I feed a Westie?
Most adult Westies weigh around 15 to 20 pounds and eat a fairly small amount, often somewhere around half a cup to one cup of quality food a day split into two meals, but that scales with size and activity, and the bag chart over-states for many small dogs. Feed to body condition, not a cup count: you should feel the ribs easily and see a waist. Small breeds gain weight quietly and it strains their joints and worsens dental disease, so count treats inside the daily total and weigh the dog now and then.
Should I feed my Westie grain-free?
Not unless your vet diagnoses a grain allergy, which is rare. Grains are almost never the cause of a Westie’s itch, the usual triggers are environmental or, less often, a protein. On top of that, the FDA has been investigating a possible link between grain-free diets built on peas, lentils, and potatoes and a heart condition called dilated cardiomyopathy. For a Westie, a complete diet from a feeding-trial brand is the safer default than a boutique grain-free food.
Westie Grooming & Skin Care
The skin-barrier and coat routine that does more for the itch than a food swap.
Westie Health Issues
Atopy, copper-liver disease, and the conditions to plan for in the breed.
Adopting a Westie
Rescue sources, real costs, and what to expect from the breed in Calgary.
Westies for Adoption
Live listings of West Highland White Terriers and terrier mixes from the rescues we track.