I HATE those collars. All of our very gentle animals became fearful and snappish on them.
We actually used a harness, duct tape and the plastic canvas used for needlepoint to make a cage for our labrador's hind leg when seh went nuts in the collar. She had gotten into barbed wire while running in a field with bro. He had to carry her over a mile home. She never ever bit anyone. Or even snapped. We could take STEAK out of her mouth she was that gentle. And in that collar she got mean.
So we used twist ties to fasten the canvas wehre it needed to be, then sewed it to the harness and used duct tape to reinforce the seams in the plastic canvas. It worked beautifully and she was no longer snappy. We did have to use bitter apple for a little while on the harness, but that was all.
I hope your furbabies are not anxious and mean in the collars. If they are, maybe with some creativity you can create some other way to protect their boo-boos.