Quite the achievement. Many years ago on a Thai beach there were a few stray dogs and the locals said one was called "Balls" because he was the only one that they couldn't sterilize. Every time the vet arrived Balls would smell him a mile away and just bolt, disappearing for a few hours.
It's sunrise and a vet stands at the edge of a parking lot, at the top of a short flight of stairs leading down to the beach below. Off in the distance a few hundred meters away, a dog jogs off down the empty beach. The vet, arms hanging by his side and feeling dejected, simply says "Balls..." and turns away.
Might be an expensive overkill for a single dog, but c'est la vie, it'll boost the GDP dumping all that money into mil dev anyway.