I have a dog with allergies, nothing worked until I went to a dermatologist and had my dog skin tested and she started immunotherapy, wasted time and money going back and forth to the regular vet for a year and received some incorrect information. There are times when it is best to just go to a specialist.
I found this site helpful. http://www.allergydogcentral.com/
Also, consider a homeopathic approach http://www.vitalanimal.com
PS: Environmental allergies are more common than food allergies, actually people tend to refer to food sensitivities as allergies
The dust mite, microscopic and on the skin of all living things (dander) is a common one…impossible to avoid.
