At my old house one of my roommates had a dog, she was a Lab/Husky mix, really pretty. Anyway, she really did like to get high, she would sit in the circle with us, we never blew smoke at her to intentionally get her high but she would get a contact high. I don't see anything wrong with that, the dog could have easily sat in the other room with nonsmokers but she prefered to be with the smokers. She was also a big alcoholic, we had to keep drinks up where she couldn't get to them (which was hard at parties, plus she was a big dog so she could get on the counters and stuff) she always managed to find a drink or two.
One time we did intentionally get a dog high though, we were staying at my friends house for the weekend and his grandma was out of town, we were smoking in the basement and his pomeranian came down and was barking non-stop. My friend kept taking him upstairs and he would just come back down, finally we couldn't stand his barking anymore so we put him in a carrier and blew smoke into it. He calmed down. It was the funniest thing in the world to watch my friends chase him around the basement with the box yelling "Lou, Lou, come on, here Lou, get in the box, get in the box Lou" which started out really sweet (you know how you talk to animals like they are babies) and turned into "God Damnit Lou get in the f*cking box! GET IN THE DAMN BOX LOU YOU STUPID PIECE OF SH*T!!!" From that point on he would come down and sit by us if we were smoking, he didn't bark, must have liked it.