Even if they had the collar on that snaps off, if she wasnt there to snap it off the dogs could of been strangele & died.
My sister left her house once, and forgot something and turned back went into the house and found one of her huskys somehow got her collar stuck on something and was being strangled, luckily she had gone back to the house, or things could have been bad.
My two never wear there collars in the house or when i am not home with them.
Outside, i put there collars on and they are microchipped also.

That must of been sooo scary JUDY!!! I am so glad to hear they are both ok!