She has a tiny head, and she's aggressive towards other dogs. I have to use a collar that won't slip over her head when she's in that mode.
She can (and does) get out of anything, including her harness. Also, she likes to pull at her harness.
I found a little nylon collar..the thing is, for it to stay on her, it has to be quite tight. I prefer a choke, which only tightens when there's pressure.
I don't leave it on her, she doesn't wear a collar except when we're walking or going somewhere.
Today she wore the plain collar and her doggles...she did well, of course we didn't see anyone else, lol.