Mine wear their collars all the time. They don't play wrestle or anything like that so I don't have a problem with these two, but Tucker will occasionally get his caught on one of the scatter rugs. With my previous dogs I did have one occasion, like Pam, where there was a more serious snag between the two. Accidently getting out is probably the more likely thing to happen in my house, hence the collar wearing. Both T & H are also microchipped.