No no , you are not crazy !!!!!
My daughter even has one for her bunnie Billie !! And the little rascal loves it !!!! Runs from here to there so fast , that my daughter can hardly follow her ....!
I've also bought one for Sydney ; but ......guess what
it is to small for him ..... !!!! Haha Sydney is a huge cat !! Maybe I'd better bye one for small doggies ??