I take Vixie's collar off when she goes to sleep or if she's in her crate and we leave. For the rest of the time she has it on since she's bolted outside twice now. Carlie only has her harness on when we go for walks and the rest of the time she's nakey!
Kai has always worn his all the time, especially since he wears a martingale and it's such a pain to adjust it. But I just got him a new martingale collar that has a buckle release and is a little thicker, so I may start taking it off at night for him.
My dogs always wear their collars. They don't have any problems with them, except when Benji was first wearing a collar he didn't like his jingling tags and kept trying to bite them off.
Scooby is micro-chipped. But dogs in England have to wear a collar and tag with owners name and address with post code every time they leave the garden so he has a collar aswell.
He doesn't wear it for bed or when we are leaving him alone. I will probabally leave it on when he grows up. Jack always had his on 24/7 it was loose enough for him to slip out of it if he needed to
Mine wear their's 24/7. the only time they get taken off is for a bath and after they are dry go right back on. I'm paranoid that if anything happens and they don't have their collars on, i might not get them back. No nekkid doggies here.
My dogs don't wear their collars in the house, and actually, I put their tags on their harnesses now, so they really have no need to wear collars at all anymore.