This may be off topic but i got two cur/bulldogs that i trust to hold a 300lb boar while i grab it. Seen em do it time and again and they are both probly not over 50lbs and they are all fearless!
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In my opinion i think its the dogs brain that makes it able to hold a hog than its size there is some things that you can do a certain way and not have to use much force. Kinda like work smarter not harder!
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Michael Conatser