When twins Tiffany and Krystle got their Chihuahua/Pomeranian mix Tigger, things were instantly twice as complicated. Tigger bites when they set him down on the bed and attacks if they try to move him when he's sleeping. Cesar comes in to catch this Tigger by the tail. Shelly Atherton wanted to follow in her grandfather's footsteps and train her own hunting dog, so she got a Labrador retriever named Dan. Dan took to the training very quickly, but had a growing aggressive streak.