No way, not anymore. About 6-8 years ago or so Nanook was laying on the floor over the heat duct. He goes to get up & his tags slid in the little slots & he was stuck.
Thankfully I was home & it was spring time so the heat & a/c was off.
What if it happened in winter, while I was gone with the heat blowing in his face, him struggling. Gosh.

The collars have a nice place on a hook right next to the door, as soon as they come in the house, the collars come off.