can you take him out on a leash ? take him to a park or something on a leash.. some leashes for cats have a harness that keeps them better.. you can also get a really long one so he has room to roam.. my kitty is an inside kitty, if anything gets on her, even a colar.. she cant walk. she feels something is pushing her down. but i take mybunnies outside, they used to be on leashes till i got a house with a fence..