I was told when my dog had a boo boo, that you shouldnt use neosporin, something in it is bad for them. Although his wound was close to his mouth (well actually in his lip) they told me you should never put neosporin on a dog. I am going to assume this is the same for cats. Just keep that in mind. And the cat if it is by his eye is just going to rub it off with his paw anyways. Im sure a little wont hurt, but who knows how long it will stay.