[anonymously]

The best choice would be to see a board-certified veterinary dermatologist, if one is available near you (here is a list: http://www.acvd.org/).

Most dermatologists will not skin test for allergies until the dog has been exhibiting symptoms for 1 year/4 seasons without any significant periods of relief. There are also other treatment options that a specialist could offer.

A summary of treatments for canine atopy:

Evidence-Based Canine Allergy Treatment

And here is a recent update:

Evidence Update- Evidence-based Canine Allergy Treatment

More info here:
http://www.2ndchance.info/allergytesting.htm
Skin tests to determine what your pet might be allergic to are considerably more accurate, on the whole, than blood tests. However, they are not 100% accurate either. To have them performed, you will need to locate a board certified veterinary dermatologist

excerpt below from: http://www.2ndchance.info/Apoquel.htm
Food Allergies are probably over-diagnosed in dogs (they account for, perhaps 5-10%). Hypoallergenic diets are occasionally, but not frequently, helpful in canine atopy cases but you should always give them a try. Food intolerances are more common – but considerably more likely to result in digestive disturbances and diarrhea than in itching problems.

via search engine here: /forums/search/allergies/

Another site: http://www.allergydogcentral