Hi Colliemad
This sounds like a gentle leader by Canac but there are also things called figure of 8's (I have one) the problem is with the Canac, if you are letting of lead, then it can be tricky to put back on and I found that you do have to take it off as there is a bit that hangs down which the dog could get caught up on. My basic obedience trainer sold me a figure of 8 whihc she says you can only get from her (maybe true, maybe marketing ploy) but I found this better as it doesn't need to be taken off when the dog is offlead as there is nothing hanging down

This may or not make sense as it is difficult to describe without seeing what I mean but there you go..
Beth