Comparing dog allergies to air/pollen allergies doesn't make sense. People don't have to bring their dogs to work, but you do have to breathe communal air. I like dogs, but think it's sort of wacky to bring them to work unlless they're service dogs. Just don't see any point to it. Heck if you can bring your dog can I bring my cat? My reptile?
I used to work in a hospital so obviously pets weren't allowed. I'd rather the boss let us have ping pong tables and an espresso machine! Lol.