maobrien.......No, I don´t know exactly what causes Deelee´s allergies. His vet says it could be a combination of things (some airborne) probably as it seems worse in the summer months and he goes outside and in but in the summer is out more than in due to his wishes.....ha!......(he´ll spray if I don´t co-operate...charming....not!....as you can see, he rules!).
In our valley, there is a lot of pollution, so I suspect the air, as I wash his bedding in soap that has no additives or perfumes. I do know, however, that if I feed him Fancy Feast, I can expect him to break out in an allergy problem, but if I keep him on a diet of Iams, he shows no particular reaction at any time of the year, so I suspect the environment.
Our area is an agricultural area and then, in California, one can throw in pollens from trees, weeds, flowers, etc., the list is endless, I think from what I see on TV......and our valley traps the worst air imaginable....you should see the color as one flies into CA from Arizona, for example. No one has any idea how bad it is unless they fly through the color change (my husband is a pilot and we fly into it as we descend....yuck!!!).
Once a vet said about my allergic dog that an animal may be allergic to this or that but until the proportions of the allergens reach a critical amount in the animal, one won´t see a problem in the pet. Given enough of a combination, the animal´s immune system is overwhelmed and we see the results on his body. He said that it is impossible to be sure which combination of irritants is the problem and one just does one´s best to eliminate any irritants that one suspects.
In Deelee´s case I can´t do a thing about the air and considering that I have developed allergies over the last two years and can only keep it under control by taking Loratadin, I am not surprised that Deelee is a mess, too. The San Joaquin Valley air is really bad in California and a lot of people are developing allergies.