I've got a good pal in NYC who, after wanting a dog for several years, finally committed upon spotting a box of abandoned puppies at a local market. Even seeing shelter kittens on cages streetside on sunny days or finding fishy faces at a pet store, I would often wish I could take one home.

Similarly, during a trip to the California Pet Center near Calabasas on Wednesday, Britney Spears went in to pick up some dog food . . . and left with a little bird, too. An eyewitness told PeoplePets that she settled on a yellow parakeet and bought a big, white cage and several toys for the bird before leaving the store. Of course, it's important to be able to care for any pet's needs both financially and emotionally no matter how much deliberation goes in, but have you ever picked up a pet when you hadn't technically planned on it?