My in-laws had a gray shorthair Tom cat "Meese". He was about average size, maybe 15 pounds but mean as snot. I picked him up a couple times and he was solid muscle. He killed everything that came in their yard, including an adult racoon (no small feat for a house cat). He had this opossum he let eat with him until it was full grown then he killed it

.
One day I heard mother-in-law feeding Meese on their back porch when I see a neighbors rottweiler trotting down the alley to get some of Meese's food.
This I gotta see, so I quickly ran around to the back yard.
Meese had this funny "ninja" like fighting technique where he'd lower his head then his claws were straight out like a blurr. Uh-oh...the dog went for his food, Meese lowered his head. All I saw was the rottweiler rolling backwards, blood spurting, the dog went home yelping.
A few minutes go by...phone rings, wife answers. A neighbor lady's yelling "your cat just tore up our dog!" Wife calmly said "Your dog was in our yard eating my cat's food, and if it was MY rottweiler I'd be too embarrassed to call". She hung up.