When I was a boy we for a time moved out in to the country, and our back garden backed on to a meadow.
At the time I have a dwarf cat, Just like the one in the above picture only smaller, black and white patches called Perky. He was a no shit taken, tough little bugger. On the second day we lived there, I found him in the meadow facing off with a friesian cow and growling in a way that said "This field is now mine and only one of us is leaving here in one piece."
The village was plague with an out break of little black and white litters of kittens to the extent we had to take him to be fixed, the vet however, looked confused and told us "Perky only has one bollock", he took it off, but the abundance of little black and white moggies continued. I guess he must have hidden the other one. But we had a certificate saying he was incapable, so people stopped hassling us.
He finally bit the dust, after getting in to a fight with a Land Rover, that I think he may have mistaken in his one eye, one ear, near toothless old age for another cow.