Dog is an animal that has lived with people as a pet for more than 10,000 years, longer than any other animal.
CITATION: McGinnis, Terri. "Dog." World Book Student. World Book, 2015. Web. 1 Dec. 2015.
Pit bull is a name commonly used for dogs that are usually some mixture of bulldog and terrier.
CITATION: Coren, Stanley. "Pit bull." World Book Student. World Book, 2015. Web. 2 Dec. 2015.
