I learned my lesson on a mouse, which I put in a tupperware bong. It was brain damaged and lived just a week after I took it out and gave it mouth-to-mouse. Since then (and that was 25 years ago), I figure if a pet wants some pot, they know how to ask for stuff. None ever has though. We do have one cat that seems to enjoy when we humans get high, because that makes us happier and friendlier I guess. She doesn't want any herself, but she prefers us humans to be stoned.