On 'Dog Whisperer' (Fri., 8PM ET on NAT GEO), NASA astronaut Leland Melvin needs Cesar Millan's help with his two dogs.
Both Melvin and his canine Jake are anxious. Millan tells the owner, "It's more important that you pay attention [to] your energy ... They'd rather have a calm human than a human who's saying 'good boy.'"
As Melvin attempts to put a temporary muzzle on Jake, the dog gets agitated and bears his teeth. Millan notes that it's a nervous reaction, not aggression. Once Melvin takes control of the situation, everyone calms down.