A couple worry that their Lab, who becomes aggressive around food, could hurt their 18-month-old son. The host also helps socialize a homeless woman's protective pit bull so they can move into a women's shelter.
Exercise guru Jillian Michaels seeks Cesar's help for a second time, wanting to ensure that her rescued Chihuahua won't get aggressive with her young daughter. Later, the host helps Kelsey Grammer and his wife, Kayte, potty train their pooches.
The host helps comedians Skyler Stone, Ralphie May, Lahna Turner and Paul Rodriguez get a handle on their unruly canine companions. Included: an aggressive Maltese-Chihuahua; an overprotective bulldog.
Robert Schwartzman, lead singer of the rock band Rooney, seeks help taming his adopted pit bull, Sandy, who's aggressive around other dogs. Also: comic-book artist Paul Lee has two adopted Boston terriers that don't get along.
In London, the host meets two dogs that have spent most of their lives in Africa and are having trouble adjusting to their new surroundings. He also works with a Jack Russell terrier that acts up around guests, and a dog walker who struggles to control her own Patterdale-terrier mix.
The host continues his U.K. tour in London, where he meets a pup named Herbie who must be muzzled in public because of past bad behavior. Also: a pair of German shepherd littermates have grown wild and dominant with one another; an English cocker spaniel refuses to ride in cars.
Cesar Millan travels to the U.K. to help troubled dog owners in the Season 9 opener. Included: a 17-year-old gets help handling his two out-of-control Jack Russell terriers; a rescue dog's territorial behavior is addressed.