corbinam
Moderator
I'm sorry to ask silly questions, but I've never seen one of these before. Do you adjust the size with the little leather piece? Are these good for just walking your dogs? They look SO MUCH EASIER than the harnesses I use.
No problem! They aren't silly at all!

Yes, you can adjust how much bigger the collar will get by placing the leather piece as a sort of stopper.
My recommendation would be to not use this as a regular leash. I don't like how tight the collar can get if the dog pulls. If you wanted an "all in one" I would recommend a slip leash with a martingale, that way it can't completely tighten against the dog's neck.
Something like this: http://www.dogids.com/dogwalker.html or what Silaria posted. Kollars by Kathryn also makes custom made martingale slip leashes. You can choose the colors of the collar and the fleece.