The razor tushes and the pronged forefeet were always ready, at such times, to wreak death on the dog, unless he should have the wit and the skill and the speed to change, in a breath, the direction of his dash.

No, pigs were not pleasant trespassers.

There was no fun in routing them.

And there was real danger.
Except by dint of swiftness and of brain; an eighty-pound collie has no chance against a six-hundred-pound pig.

The pig's hide, for one thing, is too thick to pierce with an average slash or nip: And the pig is too close to earth and too well-balanced by build and weight, to be overturned: And the tushes and forefeet can move with deceptive quickness.