Tune into the National Geographic Channel on Friday May 23 at 8 PM PT/ET to meet Buddy and Rufus! When Sherri Steele bought a foreclosed property, she was stunned to discover Buddy, a scrawny Pit Bull, chained and starving to death in the backyard. Sherri patiently nursed Buddy back to health, but later, the previous owners broke into the house and stole Buddy back. Three weeks later, a rescuer returned him to the house, beaten, starving, fearful, and aggressive. Sherri and her partner Lee Burkhart worked with Buddy to overcome his fears and helped him to coexist with their existing pack of three other dogs and a cat, but he is still both human and dog aggressive. Sherri and Lee feel they are at a stand still with Buddy and need Cesar to help turn the socially awkward Buddy into a social butterfly.

When Rufus arrived at Founders Veterinary Clinic he was in very bad condition - malnourished, underweight, and covered with demodectic mange. Six months later, Rufus's health was much better, but his temperament had completely changed. But potential adopters are often frightened by Rufus's aggressive behavior. So far, Rufus has attacked about five people. Rufus will have to be euthanized if they can't get his aggression under control. The doctor and her staff all believe Cesar is Rufus's last hope.

Then, on May 30th, meet Chipper, Rudy, and Monte! Ridgeback/Boxer mix Chipper has attacked 5 dogs and has even sent 2 of them to the vet's office! As a result, San Bernardino Animal Control required her owner, Kim Critchfield, to sign papers acknowledging that Chipper is an aggressive dog and a danger to others. Kim must make sure Chipper is muzzled, even on their property! After watching Dog Whisperer, Kim tried to have Chipper run alongside her while she bikes, but she fears that Chipper may see a dog and take off, causing harm to both of them. Can Cesar put an end to this vicious cycle?

Laurie and Don Frick opened a pet boutique called OffLeash and hoped to let their dogs Rudy and Monte hang out while they worked, but the Whippet duo doesn't seem to have the same flair for customer service that their owners do. They bark at anybody that walks into the store and must be kept in the back room. Will the Fricks ever have a pair of dogs that will live up to their store's name, "Off Leash"?