if yer dog picks these buggers up.
we shoot those bastards (porcupines, not pitbulls) out of the trees with our .22's when we're out grouse hunting, you can hear the bullets hit with that satisfying hollow-ish 'whump' sound. they're good for nothing; they strip the bark from beautiful pine in the forest, if they strip enough bark the tree dies, all winter long they're in the trees, well at least until we spot 'em.
And of course, last but certainly not least is what happens to our dogs when they encounter one, I think they have only one natural predator and that's the fisher, and fisher are few 'n far between.......