I have collars on both mine all the time. Rudy's collar actually has his name and our phone # embeded in the collar. I know we got a brocure for the collar at our vets office. We ordered it from a company in Las Vegas. Sorry, I forget the name right now. We also have both of them microchipped and they both wear their harness's all the time. I feel, the more you can do to identify your little one, the better.
