My lab mix has one (mainly for when he was younger, he's older now and not nearly as pully), and it was mostly for my mom, who he didn't really listen to back then, if he saw something interesting he would pull until she went over and looked at it too. I was concerned about the possible pain he could be experiencing, so I popped it on my neck and gave it a yank. Yeah it was really uncomfortable but not to the extent that it would cause real harm, plus his skin and hair are no doubt much thicker than mine

and he never yelped or gave any sign of pain when using it so I guess it was ok. We probably should have trained him a bit more though, a bit irresponsible on our part
