Once the Vet told me the cat had a disease from eating too many chipmunks and I should stop that from happening. I gave him a long dumb look and said OK. That was why I kept that crazy cat.
So I prayed for the cat and he kept killing them pests right on and didn't get sick again.
He used to hunt the neighborhood dogs, too. Was fine by us, kept them out of our yard. Once, our dog got into a scrap with a couple of the neighborhood mutts, and the cat came at a dead run from somewhere out in the back 40 yelling, "WAIT WAIT WAIT FOR ME!!!!". :-)
Jumped right into the middle of the scrum and helped our pup out, until Dad was able to get the garden hose around the house to break things up. Dunno what the cat was thinking, I always figured that he and the dog just tolerated each other so they'd keep getting fed on time. Guess they were more friendly than I ever knew.
He was about 20#, when in his fighting prime. Maybe the original Viking Kitty.