(We probably should have a separate "pet" forum on here!)

So I recently put collars on my cats. They don't go out and don't really want to go out, but if my house is ever broken into I'm sure they'll go explore and I want anyone who sees them to know that they aren't the neighborhood ferals (especially since one has a clipped ear from her old life).

They have the Boots & Barkley (I think - Target brand) safety collars. Clipped-ear kitty doesn't seem to mind hers. Problem is, my less-than-smart kitty has already figured out how to take hers off. The first time was an accident, I'm sure, but every morning I put it on and it's laying somewhere around the house when I get home. Is it ok to not use safety collars? Is there a trickier safety collar? What do you other cat people do? I guess I should chip them anyway but I'd like them to appear owned from the get-go.

Thanks!