Stupid allergies!?

[Natasha]

I have an english bull terrier. I realize they are known to have skin issues. Mine sure does.

Well, after contacting my breeder, she suggested it could be a food allergy, so I changed her food to Canidae Lamb & rice kibble. She's been eating nothing but that food for nearly a month and her skin issue is showing no sign of slowing down.
After taking my pup with me up to work [pet parlor] everyone said it was some type of allergy, just by the way it looked...

How do I go about figuring out what she's allergic to? Skin allergy tests are freakishly expensive, and don't alway help figure out the cause and I personally don't have that kind of money to spend.
Whenever shes outside, she sneezes uncontrollably that it's crazy. So, duh, my thought is that it's something outside that's bugging her. How can I get her to stop itching?
I've tried every type of medicated shampoo out there with no luck. I've also tried lessen her baths to once a month, and that didn't help either.

[millypeed]

The only way to know for certain is to see the vet and have the tests, my Labs allergies were diagnosed with a simple blood test, she has a dust allergie. Your dog could have an allergie to almost anything. Antihistamines help my Lab when hers flares up. You really should see the vet and get to the bottom of it before it gets any worse.