I have a Black Kitty. Another user told me that using a potion after buffing should solve the issue, but it doesn't. I'll be narrowing down what skill might be the problem, specifically - I suspect that it's Teleport, unfortunately. EDIT: After some experimentation, I've discovered that it doesn't work at all, regardless of skills, at least with Mana Elixirs and Ginger Ales.
Renamed the thread as you discovered it being specifically the pet. I have a white bunny on my mage and my bishop and both are able to use autopot, so I'm suspecting it's something with the pet as well.