Quote Originally Posted by Glacier

He pulls it over his head and somehow gets the chest band off without undoing it.
Nothing is ever undone when I find the collar off his neck.

He got it off in seconds.
He has a really narrow skull and he can just slip his head out!

... dogs aren't allowed in my office building.
"slip his head out ..."

Bummer!

Maybe put Dawg-Cufs on his front paws?

Ya know - with all that You & Stuart have done for the Local Shelter -
seems you should be able to ask them to Dawg Sit Anvik for a few hours every day.

Good Luck teaching him to leave the Zipper alone!