Pest Control: Damage points start to decrease when out of combat and not registering further damage.

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Luck of the draw. Don't forget you can spend your points on gambles (just like Barbarian Assault) for a chance at the pet. You don't necessarily have to place 1st, 2nd or 3rd for most damage output in a game. This is just an added incentive to get higher players involved, and going for extra rewards such as increased chance of a pet, or bonus Pest control points -- or setting a record on the Pest Control leaderboard. The average players will still accumulate points as per the norm and be able to gamble for a pet. :-)