JT Eaton Mouse Size Bait Station 905 does not contain any bait.  Depending on the bait you are using there are some that have antitodes in case of non-target animal poisoning such as Contrac, but in general it would take your cat eating 5-10 or more mice killed from a rodenticide for them to be harmed, the exact number varies depending on the cats weight and the bait you are using.  Also, most domesticated animals do not actually eat mice, they just play with them if they are well fed.