My dogs eat the Muenster dog food and love it, but my American Staffordshire terrier, with her thin coat and bare tummy still has allergy problems--the skin on her tummy develops a rash. I used to get a small tablet from the vet that helped, along with a steroid spray for occasional use if the rash got worse.
This year when I went in to get the allergy tablet, he said that they've switched to using the over the counter Zyrtec, that this has been found as effective for dogs as the previous prescription dose she was getting.
As an Allegra user myself, I went to one of the Dollar stores to pick up a box of 45 generic pills for about $7 (much cheaper than Zyrtec itself, or the grocery store knockoff brands). It worked just fine, and I even started using it for my allergies, and they respond well to it, so I'm not fooling with the Allegra Rx any more.
I found that Sam's Club carries a package of 350 generic Zyrtec for about $16 (Costco also has it, comparable price, but I found them to be so rude when I asked about making a purchase there without a card that I won't ever join that group, but that's another story).
So, not to hijack your topic, your original point is a good one--Muenster natural is good for the animals, in particular because it has no preservatives. But if you need a boost, try the antihistamine. Same dose for a dog as a person, one pill per day.