For CoopDog and Jarbax, allergy testing was being done to confirm that indeed, it was the pigs, and for the hay from the sounds of these two posts.
http://www.guineapigcages.com/forum/...ergy-test.html http://www.guineapigcages.com/forum/...-alergies.html
I agree, a shed unless it is built to be climate controlled, will just act as an oven, and make the problem worse.