Igor is obsessed by them, when we find them in our garden at night a fight breaks out, me shouting "hedgehogs are our friends" whilst trying to keep him away from them, snapping and snarling.
Hilarious and pathetic at the same time, I usually save the hedgehog, but the dog does scare me a bit.
Édit, bizarrely as I was writing this, I heard a barking outside, and sure enough there he was "worrying" our hedgehog. I got him inside without any injuries to either side.