Jax, Lily, and Chopper are Jack Russell Terriers, and came to training together from the same household; Jax is the father of both Lily (3, female) and Chopper (3, male). Together they had several challenges: Human and dog aggression, growling/showing teeth, nuisance barking, no recall, insecurity/fearfulness, pulling on leash, jumping on people. Jax displayed aggression towards both of the siblings. This took several forms: He would guard the doggy door and wouldn’t let them in throughout the day (discovered through video camera footage). He would also growl at them, making them unable to pass him. Jax possessed bullying behavior towards the other two, but never physically attacked either dogs or humans. Jax would also try to control Chopper and Lily’s behavior (e.g. not allowing them to come into house and approach the owners), and Chopper and Lily would not fight back. All three of the dogs had difficulties on leash, and would pull and lunge while being walked. When approaching other dogs, Lily would yodel aggressively and spin in circles. All three dogs displayed aggressive behavior towards other dogs both on- and off-leash. Due to these factors, the owners couldn’t take them all on a walk together. Off-leash, they were also difficult to control: they would rule the home, and jumped on both furniture and humans. In addition, Jax displayed aggression towards his owners at times: he would growl at them in their own bed and on the couch when the owners would show affection to him, but he never bit them. When the dogs became focused on possible prey (such as a squirrel), they would not listen or come when called, for upwards of 45 minutes at a time.