He is talking about clipping the teeth, whether it be flush with the other teeth or clipping a small bit off. This prevents the dog from running in there catching and holding,
I bet y'all don't fuss when a catchdog goes in there and pulls a canine out, y'all let them heal up and use em when you need him again.

So your saying that clipping the teeth causes them to not be able to catch and hold, but without canines they can hold just fine?