Both of my cats have figured out how to get out of any collar we tried putting on them...so we too, gave up. However, our male loves to explore the yard (supervised of course) so when we bring him outside, we put a harness and leash on him. Yes, we do get some strange looks from people passing by, probably wondering why in the world we have our cat on a leash. But...if we didn't harness and leash him, he would be chasing a squirrel up the nearest tree in a split-second...or worse, darting into the street in front of a car.