Dog food allergies can be more easily developed with some dogs than the others because some animals are seem to be predisposed to development of this type of allergy. What is misassumption is that food, which you have just presented to your dog, is less likely to trigger an allergy then the food that your dog is consuming for longer period of time, maybe even years. That's actually how food allergy is developed in most cases.
There are things that your dog's vet can do to help your dog but before you try with all that expensive tests try to do it yourself. Even your dog's vet could have troubles to diagnose dog food allergies because symptoms can easily be symptoms of some other type of allergies, mostly inhalant allergies. Also dogs often suffer from more than one problem so it would be wise to eliminate all other causes, to deal with one problem at the time and when it's just food allergies left, the food trial can start.
Even if you want to prevent this type of allergy, there is nothing you can do because the causes of dog food allergies are unknown. It is the same kind of food that have been causing the problems to humans like beef, chicken, fish, eggs and dairy products that are mostly responsible for dog food allergies, as well.
The treatment for dog food allergies is about eliminating the food that your dog had previously consumed. His meals should be replaced with a high carbohydrate and rich in proteins diet with water and nothing else for twelve weeks.
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