i would leave it on at all times if there is any chance of him getting away from you. i leave Beanie's collar on all the time, but Wolfie's i only keep on when she's outside. she can't have on all the time because it could mess up her neckline, and she needs a good neckline cause she's a showdog. i would leave it on her all the time if i could.

to leave it off just because you think he's uncomfortable is a bad idea. the collar could save his life and that's lots more importaint then his comfort.