AN INJURY THREATENS TO PULL A CANINE FRONT-RUNNER OUT OF THE COMPETITION, ON "GREATEST AMERICAN DOG," WEDNESDAY, SEPT. 3

"Dog Swap" - An injury threatens to pull a canine front-runner out of the competition, on GREATEST AMERICAN DOG, Wednesday, Sept. 3 (8:00-9:00 PM, ET/PT) on the CBS Television Network.

The Final Four fight it out during the Dog Bone Competition with a test of endurance and loyalty. During the Best In Show competition, the owners quickly find out that some bonds defy all reason. The ninth team is expelled from the Canine Academy.

DOG TEAMS:

BETH JOY and BELLA STARLET (7th Expelled) New York (originally from Chicago) Beth Joy's occupation: Bella's Acting Manager Bella Starlet's breed: Chihuahua, Labrador Retriever, Shih-Tzu, Nova Scotia Duck Tolling Retriever and Pomeranian mix (10 years old)

BILL and STAR (8th Expelled) Flint, Texas Bill's occupation: Building Maintenance Star's breed: Brittany (7 years old)

BRANDY and BEACON (5th Expelled) Orange County, Calif. (originally from Jonesboro, Ark.) Brandy's occupation: Fashion Designer Beacon's breed: Miniature Schnauzer (1 � years old)

DAVID and ELVIS (3rd Expelled) New York (originally from Camden, N.J.) David's occupation: Doctor Elvis' breed: Parson Russell Terrier (2 years old)

ELAN and KENJI (2nd Expelled) Portland, Ore. Elan's occupation: Aspiring Dog Salon Owner Kenji's breed: Giant Schnauzer (1 year old)

J.D. and GALAXY Bend, Ore. (originally from Camp Lejeune, N.C.) J.D.'s occupation: Dog Entertainer Galaxy's breed: English Pointer Border Collie (9 years old)

LAURA and PRESTON (6th Expelled) Los Angeles (originally from Parsippany, N.J.) Laura's occupation: Film Producer Preston's breed: Pomeranian (5 years old)

LAURIE and ANDREW Stafford, Va. (originally from Ravenna, Ohio) Laurie's occupation: Doggy Day Care Owner (former fitness trainer) Andrew's breed: Maltese (5 years old)

MICHAEL and EZZIE (1st Expelled) Los Angeles (originally from San Diego) Michael's occupation: Aspiring Comic Ezzie's breed: Boston Terrier (2 � years old)

RON and TILLMAN (4th Expelled) Oxnard, Calif. (originally from Santa Monica, Calif.) Ron's occupation: Construction Manager Tillman's breed: English Bull Dog (3 years old)

TERESA and LEROY (9th Expelled) Fairfax, Va. (originally from Boston) Teresa's occupation: Dog Sitter (former high school Latin teacher) Leroy's breed: Border Collie (5 years old)

TRAVIS and PRESLEY Los Angeles (originally from Perry, Okla.) Travis' occupation: Bartender Presley's breed: Boxer (1 � years old)

GREATEST AMERICAN DOG is executive produced by R.J. Cutler, Stu Schreiberg and Stephen Kroopnick for Magic Molehill Productions, Inc., in association with Actual Reality Pictures and Triage Entertainment, Inc.

RATING: TVPG-L