Different as night and day

Tango

Booker

Tango and Booker are my dogs. Tango's a 4-year-old, 14-pound Brussels Griffon, black with a rough coat. Booker is a Boston Terrier, almost 7 months old now, and about the same size as Tango. But size and pushed-in noses are about the only things they have in common.

Tango is grumpy, wary and suspicious of others. Booker is happy, outgoing and eager for anything! What makes them tick?

Why are some dogs, and people, for that matter, cranky and crotchety? How do their personalities affect training, home life, and relationships with others?