Liz Buchanan BVSc MRCVS
Keymaster
Hello! I really hope some other owners post on here for you with their experiences. As an owner, diagnosing an allergy must be extremely frustrating. It's frustrating for vets - food trials may be the ultimate way of figuring out if a dog will be okay on a certain diet going forward, but they are also a slow process. When they say 'that food and nothing else,' they mean it: if, for example, a dog is allergic to potato and steals a chip in the pub at lunch-time, a potato-free diet is not going to be effective. It may also take quite a long time on the novel diet before results are seen - maybe even as long as 6 weeks? Please don't rely on my figure for that - check with your vet. Sometimes an allergy is seen to something in the first diet and so the dog doesn't respond to it - and responds to the second or third.
The other thing to consider is whether external / environmental allergens may be involved, because if something in the environment is making a dog itch, then this would skew the results. Parasites are a biggie - most owners know whether their dog has fleas, but not whether their dog is meeting someone else's fleas e g the dog they play with down the wood, or the dog who uses the office before them, which can be significant if they're allergic to them, so on-the-dot flea treatment is vitally important in skin cases and may help up to seventy per cent of dogs.
In conclusion, allergies can be long and difficult to treat. Run a search in our blog for an article by Kate Cavanagh; Do dogs get food allergies? - which may help to answer some of your questions.
Best of luck.
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