Parents' dog has a nylon collar with an ID tag (his name, our home # and our cottage #) plus the other necessary tags. My dog has a leather collar with an ID tag (Name, address and phone #) plus the others. The collars are on 24/7 unless it gets ridiculously annoying and then we take them off in the house, but they're on when we let them out of the house.

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What doesn't kill you; is sure to leave a horrible scar. 
Success is not final, failure is not fatal: it is the courage to continue that counts.