I'm in two minds about this. I like the idea of our puppy being collar free in the house, more comfortable for him, safer perhaps? However, over the last few years I have had two dogs turn up on our doorstep, one had a collar with a tag and a quick phone call reunited her with her owner and the other had nothing and it took a good few hours and phone calls to vets, dog warden etc before his owner was finally found. Also, this was some time ago and I suppose micro chipping is becoming much more common. What do you do/think?