In the original 1992 Castle Wolfenstein 3D, you fought off Nazis and their dogs.
Now there's a mod called Woof3D -- also known as "Return to Castle Woofenstein" -- which removes all the nazis and the guns, and all you do is ... pet the dogs.
There's a big ol' castle full of dogs wanting pats and you're the one to pet them. Sorry, they jump up on you, I hope you don't mind dog paw prints on your jeans. Just pat them and they'll fall asleep pretty quick.
Windows only! My son installed the game on his Windows PC and we played it, and I was surprised to find that it's actually kind of hard -- I'd expected that the dogs just, y'know, licked you or stuff, but it turns out they also jump on you and deplete your health, so you can be licked to death, I guess. They do seem to fall asleep pretty quickly with a pat or two, though.
There's some fun in-game art, too ... 
