I use a leather collar with a buckle, but I only put a collar on the dog when we are leaving the property. At home dogs are naked. Most are chipped. I haven never had a collar accident, but then, I am usually actively interacting with one dog when there is a collar on anyone.
I had a choke chain accident with my first GCD, where he fell asleep on the deck and the ring fell through the slats of the decking and he tried to stand up and couldn't. Then he panicked and circled around and around, and finally made a strangled cry. I went out there thinking he attacked someone and found him stuck to the deck. I quickly called my landlords and they rushed over, and the three of us managed to get him free.
No collars on my dogs when I am not supervising. Though I do leave rick rack or puppy collars on babies, and haven't had a problem with that.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC