I got dry mouthed just reading about your dogs. What a horrible experience, not so sure I could have gone through something like that without losing my sanity. The best part was the happy ending. Bet you won't forget those collars again, I hope they will remember how sore and tired they were and won't try that again, but dogs being dogs I guess it's too much to ask.
It would be so interesting to hear the version of their adventure.