It is often said that a dog is a best friend. In fact, after cattle, dogs are the oldest domesticated animals. Dogs have lived with humans for over 10,000 years and have been selectively bred for various types of domestication. Domesticated dogs have performed many roles in society throughout history-rescue dogs, hunting dogs, guide dogs, and police dogs to name a few. Besides dogs, humans have opened their homes to numerous organisms, including cats, birds, lizards, snakes, and rodents. Yet, how much do people really know about the animals that live with them? And, have these animals learned from people? The study of animal behavior is called ethology. This article describes two activities on pet observation.