Yelling won't work. You have to keep yourself in check and have control of what you're doing if you want to even think of controlling a living creature.

[Green will try some very basic body language to get the dog to sit. Touches on the nose and hand gestures to get the dog to follow instruction, all while focusing and giving the dog a decent amount of respect. He's not even using verbal commands, trying to see if it's an intelligence or obedience issue.

He's starting a bit more to suspect a trainer issue.]

A trainer that gets frustrated is only going to send mixed messages. A trainer with no patience is a useless one.