Heh Phred, thanks for the advice but my dogs are as far from aggressive as you could get. I am sorry, but I really don't want my dogs choking to death while I'm not home. Strangers have come in before when I'm not home (workmen, friends, etc) and my dogs do not bolt the door. I know it'd not be so good in a fire, but there is way more of a chance of their collars getting stuck again than there is of a fire IMO. So I'm not rethinking this decision