I am a trapper and a bird dog owner. I feel there is a problem with 220 and 330 body grips. I don’t use either. I perfer snares w/o drowners for beaver. If a dog gets caught they will act like they are on a lead and can be let out without any harm. As far as the “box”, this is generally a dry land set for coon. The trap should be in the box far enough so a dog can’t get its head in the trap. But I know of a smaller dog that get into one and ran around with a 160 around his head for a week. This trap was set by a trespasser on land that I was trapping. My personal feeling is if the state of WI would allow cable restrantes for coon there would be alot less of this happening.