I've never done it but i have heard stories of ppl who have done it and it ends with (usually) hilarious results.
My little kitty would always come around when I would smoke, so I would blow a little bit of smoke above her head and let her take what she wanted.... Never blow smoke into an animal's face if they don't want it, that is just being a bastard.
i get my calico cat high sometimes.........blow smoke in a big bag and let her chill under it for a minute.....i really thinks she like gettin stoned she climbs all over me loving on me like crazy....its pretty chill lol look at lou dog down there he must of been stoned all the time....yaaa know