How tight do you put them on. Been getting my two used too it this morning. But the way it is fitted at the moment if they did decide too pull it over there heads they could on the other hand if I try do it up one more notch they don't like it much.
There necks seem the same thickness as there heads. But they don't seemed bothered by them apart from when I am putting them on.
I guess if they did get snagged under ground being able to pull out of one would be a good thing