Somebody, probably a vet, has told you to put your dog on a novel protein, and now you are looking at a tin of kangaroo wondering how on earth it came to this. The word "novel" is doing a lot of work in that sentence and almost nobody explains it. This guide covers what a novel protein actually means, which of the rare ones are genuinely novel for a British dog and which only look it, what each costs, and how to choose.
The short answer
A novel protein is simply a meat your dog has never eaten. That is the whole definition. It is not a quality grade, not an exotic treat, and not inherently better food. It works because a food reaction is a learned response to a protein the dog has met many times, so a protein with no history cannot be the thing they are reacting to.
Of the rare proteins we stock, horse and kangaroo are the most genuinely novel for a UK dog, with ostrich very close behind. Fish is the weakest of the four, because salmon and white fish are in almost every food sold as "sensitive". On price, horse is the cheapest to feed and ostrich the dearest.
Why "novel" depends on your dog, not on the animal
This is the part that gets lost. Novel is relative. If your dog has eaten duck since they were a puppy, duck is not novel for them, however unusual it sounds on a menu. If they have never had lamb, then lamb, which is in half the supermarket aisle, is a novel protein for your dog.
So the first job is not shopping. It is working out what they have actually eaten, and that means reading the ingredient panel of every food, treat, chew, dental stick and training reward that has been in the house. The usual discovery is that a dog who "only eats chicken" has in fact had beef, lamb, salmon, turkey, pork and white fish by the age of two, because multi-protein recipes and "meat and animal derivatives" are everywhere.
Once you have that list, pick something that is not on it. Our guide to running an elimination diet for dogs covers the audit and the eight to twelve week trial that follows. This guide is about choosing the protein itself.
The rare proteins we stock, ranked by how novel they really are
All the Happy Dog Pure tins below follow one rule: one animal protein, nothing else. No soy, no grain, no vegetable filler, no hidden meats, with vitamins and minerals added so each is a complete food rather than a topper. Happy Dog is a German family brand made in Wehringen, Bavaria by Interquell, with pet food expertise going back to 1965. Every price below was read live this week.
1. Horse: the rarest of the lot
Pure Sensitive Horse (Montana) is 100 per cent horse meat and offal. 400g tin £3.79, 800g tin £5.69, six 400g £20.89, twelve 400g £35.09, six 800g £31.29. The dry equivalent is Happy Dog Montana at £8.29 for 1kg and £59.19 for 10kg.
Horse barely appears in European pet food, so the odds that your dog has encountered it are very low. It is lean and highly digestible, which helps when a gut has had a difficult few months. This is usually where owners arrive after chicken, beef, lamb and fish have all been tried and the itching has not stopped.
Best for: the multi-allergy dog who has already been through everything else. Also, as it happens, the cheapest of the four to feed.
2. Kangaroo: as far from a British diet as it gets
Pure Kangaroo (Australia) is 100 per cent kangaroo meat and offal. 400g tin £4.19, six £23.69, twelve £40.79, thirty-six £119.89. There is no dry kangaroo in the range, so this one is wet only.
Almost no UK dog has eaten kangaroo, which is exactly the point. It is also naturally lean red meat, which tends to suit dogs carrying a bit more than they should, so it does a second job if weight is also on the list.
Best for: a first novel-protein trial, and for dogs who need to lose a little while they are at it.
3. Ostrich: novel, and it comes in both wet and dry
Pure Ostrich (Africa) is 100 per cent ostrich meat and offal. 400g tin £4.69, six £23.69, twelve £44.59, thirty-six £132.99. The dry match is Happy Dog Africa at £8.29 for 1kg, £32.29 for 4kg and £64.69 for 12.5kg.
Ostrich is a protein most British dogs have simply never encountered, and the Africa recipe is grain free, gluten free and built on potato rather than cereal. The practical advantage over kangaroo is that you can run the whole diet, kibble and tins, on one protein.
Best for: a dog who needs kibble as the main meal, where you want wet food alongside without introducing anything new.
4. Sea fish: useful, but be honest about it
Pure Sea Fish (Norway) has sea fish as its only animal protein. 400g tin £3.79, 800g tin £5.69, six 400g £20.89, twelve 400g £35.09. The dry equivalent is Happy Dog Karibik, a deep-sea fish recipe, at £8.29 for 1kg and £60.99 for 11kg.
Fish has one genuine advantage the land proteins do not: it is naturally rich in omega oils, which support the skin barrier directly. If your dog's problem is a dull coat or itchy skin, fish does two jobs at once and owners often notice the coat first. Our guide to the best dog food for itchy skin goes into that side of it.
But, and this is the thing most guides will not tell you: fish is not reliably novel. Salmon and white fish are the default protein in nearly every food marketed as sensitive, hypoallergenic or grain free, so a dog who has been through two or three "sensitive" diets has almost certainly had fish already. As a strict exclusion protein it is the weakest of the four. As a skin and coat food it is the strongest.
Also worth knowing: wild boar and duck
Two more that sit in the semi-novel bracket. AATU Pork and Wild Boar at £18.49 for six 400g tins brings in a protein most dogs have not met, though it is paired with pork, which many have. Happy Dog France is duck and potato, £8.29 for 1kg and £60.99 for 11kg, and duck is a reasonable step if your dog has genuinely never had it. Check the panel against your own list rather than assuming.
The one to avoid if you are testing properly
Happy Dog Canada is grain free and gluten free with a higher protein percentage, and it is a good maintenance food, but it is built on salmon, rabbit and lamb. Three proteins. That makes it the wrong choice for an exclusion trial, because if your dog reacts you will not know which of the three caused it, and if they improve you will not know which to keep avoiding. It is easy to buy by mistake, because rabbit sounds like a rare protein and it is, inside a recipe that also contains two common ones.
The same logic applies to anything listing "meat and animal derivatives". A panel that does not name the species cannot be used to exclude a species.
Matching wet and dry so the diet stays single-protein
If you feed both, the tin and the kibble need to be the same animal, or the trial is pointless. The pairs that exist in our range:
- Ostrich: Happy Dog Africa kibble with Pure Ostrich tins.
- Horse: Happy Dog Montana kibble with Pure Sensitive Horse tins.
- Fish: Happy Dog Karibik kibble with Pure Sea Fish tins.
- Kangaroo: no matching kibble. Kangaroo has to be fed as wet food only, which is worth knowing before you commit, because it is the most expensive way to feed a large dog.
If you are weighing up the two formats generally, our guide to wet versus dry dog food covers the trade-offs, and how much wet food to feed a dog has the portions.
What it actually costs
This is where the choice usually gets made, and the headline price per tin is misleading because the pack sizes differ. Cost per 400g of food, at this week's prices:
- Horse: £3.79 buying single tins, £2.92 in twelves, and £2.61 in the six-pack of 800g tins, which is the best value in the whole range.
- Sea fish: identical pricing to horse, £3.79 singly down to £2.92 in twelves.
- Kangaroo: £4.19 singly, £3.40 in twelves, £3.33 in the thirty-six.
- Ostrich: £4.69 singly, £3.72 in twelves, £3.69 in the thirty-six.
Horse and sea fish are cheaper per kilo mainly because they come in an 800g tin and the other two do not. If budget is a real constraint and both proteins are genuinely new to your dog, horse is the sensible pick.
Scale matters more than most people expect. Feeding a 15kg dog entirely on tins runs to somewhere around £5 to £7 a day depending on the protein. The same dog on the matching kibble is closer to £1.30 a day, because Africa works out at about £5.18 a kilo in the 12.5kg bag and Montana about £5.92 a kilo in the 10kg. Feeding half and half lands in the middle, at roughly £3 a day. None of that is an argument against wet food, which many dogs eat far more willingly, but it is worth knowing before an eight to twelve week trial on tins alone.
Start small. Whichever protein you pick, buy a 1kg bag at £8.29 or a single 400g tin at £3.79 first. Dogs are opinionated, and a rare protein smells and tastes nothing like what they are used to. A 12.5kg bag of something your dog refuses is an expensive lesson.
How to switch
Slowly, over about seven days: a quarter new food for two days, half for two days, three quarters for two days, all new by day seven. Stretch it to ten or fourteen days for a delicate stomach. A gradual change is gentler, and it also means that if something disagrees you can see where it started.
Then, if this is a genuine exclusion trial, feed that one protein and nothing else at all for eight to twelve weeks. Not a chicken treat, not a beef chew, not a crust of toast. One daily treat containing the trigger protein is enough to keep a reaction running for the whole trial, and that is the single commonest reason people conclude a food "did not work".
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Frequently asked questions
What is a novel protein in dog food?
A novel protein is simply a meat or fish your dog has never eaten before. It is not a quality grade. Food sensitivities are reactions to proteins a dog has had repeated exposure to, so a protein with no history cannot be the cause. Which proteins count as novel depends entirely on your individual dog's diet history, not on how exotic the animal sounds.
Which novel protein is best for dogs with allergies?
Horse and kangaroo are the most genuinely novel for a British dog, because neither appears in mainstream UK pet food, with ostrich close behind. Fish is the least reliable choice as an exclusion protein, because salmon and white fish are in most foods sold as sensitive or hypoallergenic, so most dogs have already had it. Check your dog's own history before choosing.
Is kangaroo or ostrich actually better for dogs?
Neither is nutritionally superior in itself. Their value is that almost no UK dog has eaten them, which is what an exclusion diet needs. Kangaroo is naturally lean, so it suits a dog who also needs to lose weight. Ostrich has a matching dry food in the range, so you can keep the whole diet to one protein. Both are complete and balanced.
Is fish a novel protein for dogs?
Usually not. Salmon and white fish are the default protein in nearly every food marketed as sensitive, hypoallergenic or grain free, so a dog who has tried a few sensitive diets has almost certainly eaten fish already. Fish is still worth feeding for the natural omega oils, which support the skin barrier, but it is a weak choice if your aim is strict exclusion.
How much does novel protein dog food cost in the UK?
Per 400g of wet food at current prices: horse and sea fish from about £2.61 to £3.79 depending on pack size, kangaroo from about £3.33 to £4.19, and ostrich from about £3.69 to £4.69. The matching dry foods are far cheaper per kilo, about £5.18 a kilo for ostrich in the 12.5kg bag and about £5.92 for horse in the 10kg. Feeding a 15kg dog entirely on tins costs roughly £5 to £7 a day against roughly £1.30 on kibble.
Can I mix a novel protein with my dog's usual food?
Only during the seven to fourteen day transition. After that, mixing defeats the purpose: if the old food contains the protein your dog is reacting to, the reaction carries on and the trial tells you nothing. If you want both wet and dry, use the matching pair so both are the same animal, for example Happy Dog Africa kibble with Pure Ostrich tins.
Why is a multi-protein food wrong for an elimination trial?
Because you cannot interpret the result. A recipe built on salmon, rabbit and lamb contains one rare protein and two common ones, so if your dog improves you will not know which to avoid, and if they react you will not know which caused it. For a trial you need one named species and nothing else, which is why single-protein tins exist.
Featured in this guide: Pure Sensitive Horse · Pure Kangaroo · Pure Ostrich · Pure Sea Fish · Happy Dog Africa · Happy Dog Montana · the full wet food range. Free UK delivery over £30.
General information, not veterinary advice. An exclusion diet is worth running past your vet first, particularly if your dog is on medication or has another condition.