It's something they need to be slowly worked into, my old dog when he was a puppy loved the smell of pot, he'd always nibble on my bud and stems, and he'd sit up straight right on my lap when I smoked every single time. I'd gently waft it down in his face once or twice and he'd chill to some pink floyd or jazz with me. Adorable. I had a cat, hated it, would run away when I pulled it out to bust.
In the end it just depends, either or you need to slowly introduce it and gauge the animals personality and tastes - they have these you know.