This letting pets run so they won't be depressed thing. You know what depresses an animal? Getting hit by a car. For whatever reason last weekend everyone in my neighborhood had cats and dogs out running loose in their yards and subsequently in the street. I had a dog run from the side (I didn't even see it) and get under my car and then tangled up in my wheels before it ran off and I was driving real slow that day under 20 mph. Couple days later I felt like I was driving through a gauntlet of cats on another street in town darting out of nowhere in front of my car.
Few things in the pet world drive me crazier than than people letting their animals run unsupervised and uncontrolled.