When I first got Betty, I tried the harness on her. She got over the
falling over and rolling around thing after a while, but I was never
able to train her well on the leash. She didn't seem to get the
concept of my not wanting to follow her under cars and through bushes.
I don't think she's a constitutional sort of cat, so I haven't tried
since. I sometimes carry her outside to get some fresh air, but she
doesn't seem to think much of it. She's an indoor creature.