In our practice we sometimes joke with each other about specializing in aggressive Chihuahuas.

Surprised? Most people don't worry about small breeds developing aggression. But the truth is it's easier to ignore the signs of bad behavior in small dogs because they seem more like babies than dogs to us.

Dogs and human brains share many features. But dogs interpret human behavior in a purely canine way, and that's different from the way we people see it.

When people provide everything the dog wants when he wants it, the dog begins to respond by increasing demands. Then, one day, the owner sees the dog guarding a toy or food and decides enough is enough. The result? A dog bite.

The relationship too often goes downhill from there. Be forewarned and forearmed with proper training and socialization, even with -- especially with -- tiny dogs.

Animal behavior experts Susan and Roland Tripp are the authors of "On Good Behavior." For more information, visit their Web site at AnimalBehavior.net.