Max has nailed two squirrels already, and he's always on the look-out for more.
Last spring, he snagged a baby.

Poor thing! I think Max was just trying to play with it--he was still a baby himself.
I tried to get him to leave it alone by making noise in the yard. I wasn't intervening past that--if it's mama and papa were watching, I wasn't game to mess with them.
Then in the summer, the day before a party we throwing in our backyard, DH looked outside and said, "I see something brown in the grass." I told him it must be dog poop and handed him a paper towel to clean it up.
He came back in to get a garbage bag--it was no poop, it was a bloody squirrel carcass!
Earlier that day, I was outside setting up for the party. I did not see any dead squirrel body then. Only Max and DS were in the yard after that, so I'm fairly confident it was Max who took out the squirrel.
Oh, for those of you who don't know Max, he's an 85 pound lab/rottie mix. I'm not sure that rotties are natural hunters, but labs are, and Max is definitely a hunter.