My black cat also is the cul-de-sac monitor. If you don't live here, he knows it and growls at you. Granted, he's inside looking out a window, but still, good first line warning.

He doesn't like - in order - UPS, cars with loud stereos, FEDEX, the garbage truck, the recycle truck, and any car that doesn't belong in the neighborhood. He likes one black dog, and that's because the dog is about half nuts like he his.

I consider Oliver to be my first line warning system. The house alarm is second. Oh yeah, he hates the house alarm and the smoke detector, as well as the ice machine in the fridge.