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Allergies4 min read

The elimination diet, explained properly

by Ben, co-founder

The elimination diet, explained properly

Strip away the jargon and an elimination diet is one idea: if the immune system is reacting to a protein it knows, feed a protein it doesn't know and watch what happens. Everything else is discipline and patience.

Why a novel protein

Allergy needs acquaintance. The immune system can only react to a protein it's met before, which is why dogs are allergic to the everyday meats - and why the test diet has to be built on something genuinely new to your dog. For a dog raised on chicken, beef and lamb, that shortlist is short: think insect, venison, horse or a hydrolysed prescription diet, where the protein is chopped too small for the immune system to recognise.

Novel only works if it's also pure. A single protein source, a short ingredients list, and a manufacturer who can tell you exactly what's in the bag.

Why shop-bought shortcuts fail

Two traps catch most people. First, brand-swapping: moving from one chicken-and-rice food to another chicken-and-rice food with nicer branding tests nothing. Second, the "limited ingredient" aisle: independent testing has repeatedly found proteins in shop-bought limited-ingredient foods that weren't on the label - traces of chicken in "salmon" foods and so on. Fine for most dogs; fatal for a trial, because one hidden protein quietly voids eight weeks of effort.

The method, condensed

  1. 1

    Pick a novel protein

    A single protein your dog has genuinely never eaten - insect, venison, horse, or a hydrolysed prescription diet. Check the whole label, not just the front.

  2. 2

    Switch over a week

    Move across gradually, and film your dog before anything changes. You'll want the before.

  3. 3

    Feed that and water only

    Eight weeks, nothing else. No treats, scraps, flavoured chews or flavoured medications without checking first.

  4. 4

    Watch the gut, then the skin

    Tummies tend to respond within about two weeks. Skin is the slow one - five to eight weeks.

  5. 5

    Judge at week 8

    Against the day-one footage, not against memory. Gradual change is invisible day to day.

  6. 6

    Prove it (optional)

    Re-challenge with the old food. If food was the trigger, the itch usually returns within days.

That's the entire test - the one every allergy workup eventually arrives at. Our 8-week trial series walks each step in detail, from the switch to the prove-it ending, with honest expectations for every week along the way.

read next…

the food behind the project

One novel protein.
None of the usual suspects.

Some Grub is a cold-pressed, hypoallergenic dog food built around insect protein - a protein most dogs have never met, which is the whole point of a food trial.

See the food