I had it on the smallest it could go and with in a few hours he had the bottom part of his collar in his mouth were he couldn't get his mouth shut. I took it off and put it on here. lol. Mine isn't over weight. I wish I new what a over weight yorkie looked liked. I new to yorkies. The one I have is the first one I have ever met :)
I no that's why I got it for my dog but its too big :( I think I migyt have already said this in the description but he's a yorkie. Good luck on winning this. :)