My dog can't wear a regular collar because of IVDD. I had a sitter coming to the house while we were away for an afternoon, and I wanted my dog to have identification on him, but I didn't want to leave his harness on for 12-15 hours. I figured I'd give the Undercollar a try. It worked great, didn't come off even though it is a little too big for him, and gave me peace of mind in case he got out that he could be located. My phone number and his name are on the label, and you get extra labels. I like it so much, I bought another one for my large dog! Regarding the second collar, I had to contact customer service with questions and they were excellent, responded right away, and were very accommodating.
