I just received my Rubitclips for the dogs' collars. They are tiny carabiner clips to which you attach their tags. If you're a chronic collar switcher like I am, you'll love how easy they are to switch from collar to collar, and yet, they are SECURE, more than any other quick change tag holder I've tried before.
rubitclips.com is the website, Really like them! The large is great for Echo's size (50lbs) and the jr are teeeeny tiny, maybe even a little on the small side for Lexi and Darby and woudl be great for our itty bitties.