I had a husky dog that would instantly go for the kill if any squirrel came within leaping distance. Saw him jump six feet straight up, after the squirrel jumped, and pick that squirrel right out of the air. The dog would jump up on top of the car to take a nap or keep a lookout for squirrels. I think it was a dog; too small for a wolf.
I have a Shepherd that actually hunkers down, stalks and pounces like a cat. He's not always succesful, and the contest evolves into a more traditional canid pursuit should the prey dodge the initial onslaught. He does have a surprisingly high "hit" ratio, which increases proportionately with degree of embarassment he'll subject me to by parading around and into the house with a freshly killed squirrel, possum, turtle (cracked the shell with his jaws...took me a little while to figure out what it was), or other critter. Many first time visitors to my place have been honored with the presentation of nature's bounty.