When we took our dogs to puppy training at the humane society, the trainer (about 25 years with the humane society) told us to have as much identification on our dogs as possible. Have them microchipped, tagged, and registered with the local society. We live in Florida, and she said after the 2004 hurricanes, there were so many good dogs put down because there was no identification on them, and there was just not enough room for them all. Ours are chipped through our vet; a tag with their name, our names, and our phone number; and another tag registered with the local humane society.
A couple of problems we've had with the chip: Ours were microchipped before they came to us. The first one somehow worked its way out and was found in his fur. The 2nd one didn't register when checked by our vet. We had them both rechipped. For some reason, I checked with Avid (who keeps the information) several weeks after registering them, and they had totally messed up the information. If either had been lost, and the information on file with Avid had to be relied upon, it would not have worked. In spite of this, it's still good to get this. Collars containing tags can be lost.
True enough. Looks like he's wearing a collar in his pic.