I checked with every young and old trapper I knew before making that statement about animals NOT chewing their feet off. Then, I sent some PMs to several websites where I asked several very experienced trappers for their opinions on the subject. One thing every one of them stated was that an animal WILL NOT chew it's foot off if it has feeling in that foot. So, blood flow being cut off to the foot, by a trap, is caused by several factors.
The most common causes were; If you use a trap larger than a #2 that is not "offset", it may squeeze the animal's foot so hard that the blood flow is cut off, it loses feeling, and will allow the animal to chew it's foot off without feeling it.
They also talked about "tuning" or "adjusting" a trap correctly. I don't know what that means. Sorry.
The colder the weather, the quicker an animal will lose feeling in an extremity that is caught in a trap. Checking your trap every day should help greatly in that regard.
7L Farm I have not trapped nearly as much as you have. My knowledge of trapping is far inferior to yours. My total numbers of trapped predators will never approach the numbers you have compiled. Your participation in this thread is very much appreciated and welcomed. I am trying to portray trapping in a different light than most people might consider. Thanks for your input.
Just like differing opinions on incubation humidity, poultry nutrition, feeder and waterer types, do your research and come up with a game plan that will keep your stock safe from those predators that kill them. This is intended to assist you guys in making a more educated decision.