I know this was mentioned on another thread here--which was where I learned of it, but I HIGHLY recommend the cat walking jacket.
Here's a link to it:http://www.hdw-inc.com/walkingjackets.htm
My two Houdinis, um, I mean Bengals, easily learned how to back out of a traditional harness. The walking jacket, though, has stymied their best efforts. It may look like a straitjacket, but I assure you that if you expose them to this while they are young, they have no problem with it. Once they associate it with going outside, they are quite patient with you putting it on them!
I gotta admit that while my two have managed to squrm their way out of TWO of the three straps holding them in (yes, they know how to open doors too), they've not figured out a way yet to get out of the neck strap. Phew!
Well worth the price!
Now one of them is slowly learning how to play with the neighborhood dog...boy is THAT interesting! My Frankie kitty is actually protecting me when he thinks the "big bad doggie" is "attacking" me!
I can't believe it...