danmakine wrote:
^ I've had a collar break from wrestling, no harm to either dog. If my dog is with other dogs I'll take her collar off.
Just to clarify, I have 3 dogs (soon 4).  Two are large and are siblings.  They wrestle with each other all the time, they are 5 years old and I don't think that form of play is going to stop anytime soon.  We've had a few instances where one of them grabs the other's collar in wrestling, and then when the dogs hit the ground (still wrestling) the collar has twisted around the other dog's jaw.  Yelping and screaming ensues.  The last time it happened was at least 3 years ago - - Gracie had Baxter's collar twisted around her lower jaw, she was frantic and started biting his neck and was screaming, Baxter in turn was biting at Gracie (what he could reach, since she had his collar locked on her jaw) and screaming, I reached in to get them apart, got bit and started screaming.  My other 2 dogs at the time were jumping around barking and hollering because of the commotion and the blood - - from both dogs and from me.  I ended up pretty much sitting on the 2 and reaching back in and unsnapping the collar.  Everyone (including me) went to their corners to lick their wounds.  Gracie had a sore jaw for a few days and a puncture wound from Baxter biting her.  Baxter had a few holes in him from Gracie.  I had a bloody and bruised hand.  That was the last time I had collars on my dogs.

By the way, the dogs were playing, they were not fighting.  But once Gracie was getting her lower jaw pinched and twisted, all the fun was gone.  Since we're in the country and the dogs, if they got some bizarre notion to run away, would be going through fencelines and woods and bramble and weeds, I see no point in a breakaway collar in terms of helping someone return them to me.  Because a breakaway collar would be broken away before they ever got off my property.  They are microchipped though.