1. Gracie, Tiger and Klondike

Gracie finds herself competing to be the "Greyhound" for Greyhound Bus Lines advertising. Tiger guards 1,500 sheeps against bear attacks in Northern British Columbia, and a groomed English sheep dog in Miami puts his herding genes to the test.

2. Popsicle, Harvey and Tattie

A drug dealer's dog that was rescued by the police, now catches drug dealers on the Mexico/Texas border. Harvey turns a one-day visit to a seniors' home into a full-time job, and a border collie named Tattie keeps a golf course free of geese.

3. Tilly, Murphy and Madison

A border collie named Tilly who investigates fires. Murphy is a golden retriever assists with physical therapy for children who learn to walk, and a six-month-old puppy becomes a bakery employee.

5. Ginny, Basil and Freddie

Ginny and her owner rescue injured or abandoned cats in New York City. Basil looks after 8,000 merino sheep in the outback, and a great dane named Freddie is employed as a walking billboard.

6. Rowdy, Wizard and Rio

Rowdy is the lead star of the TV series "100 Deeds for Eddie McDowd", and Wizard works as a waiter and a service dog for a restaurant owner who's in a wheelchair. Rio, a Portuguese water dog, retrieves baseballs batted into the bay at San Francisco Giants games.

7. Tombre, Rosa and Gabe

A Labrador retriever named Tombre brings hope to a disabled man. Rosa, a professional Frisbee-playing dog, travels from Japan to New York for a competition, and a golden retriever named Gabe works at a campsite in British Columbia.

8. MacKenzie, Bear, Tess and Blue

Witness the unbreakable bond between a blind woman and her guide dog MacKenzie. Meet Bear, a Newfoundland that trains lifeguards, and Tess & Blue, border collies that herd elk back into the wild.

9. Fay Wray, Jake and Toby

Fay Wray is a canine Mona Lisa who's legacy lives on in William Wegman's world-famous photographs and videos. Meet Jake, a German shepherd employed by the Coast Guard, and Toby, a pooch trained to sniff out drugs in high schools.

10. Marty, Tasha and Nana

Marty is the star of the Madcap Mutts, a troop made up of dogs rescued from shelters, and Tasha is a shepherd mix who can alert her owner of oncoming epileptic seizures. Nana, is an Akita with a history of biting that has to learn obedience fast if she wats to stay with her family in Tokyo.

11. Kiyoshi, Brix and Ellie

An Akita named Kiyoshi works at a hospital and an elementary school, and a German shepherd fights crime in Niagara Falls. A Cavalier King Charles spaniel adopts a family of orphaned rabbits.

12. Yukon, Biggles and Kodak

Yukon is an American-Canadian shepherd who works in the Alps to rescue stranded skiers and snowboarders caught in avalanches. Biggles is a leader of a pack of bloodhounds in the English countryside, and Kodak is a German shepherd who entertains tourists in Wisconsin.

13. Johnny, Bozo and Flip-flop

Johnny leads a team of huskies on a 500-mile race across Wyoming. A Labernois named Bozo helps his owner do her job at the bank, and Flip-Flop and his owner surf the cold British seas.