What is your favorite pet? My favorite pets are guinea pigs. Would you like to learn about them? In My Favorite Pet: Guinea Pigs, students will learn about having guinea pigs as pets. Each My Favorite Pet book includes information on where pets live, how they play, and what they eat. Sample Text: Guinea pigs aren't actually pigs. They are rodents. Guinea pigs like to play with other guinea pigs. They are happier when they are together.