Related Clues:

• Horse's halter
• Stop
• Rider's 'Stop!'
• 'Shoo!'
• 'Scram!'
• 'Stop!'
• 'Holy smokes!'
• 'No way!'
• 'Vamoose!'
• 'Hold it!'
• Skedaddle
• Command to Dobbin
• 'Beat it!'
• 'Amscray!'
• 'Not so fast!'