Possible Clues:

• Unleashed, with 'on'
• Released for attack
• Urged to attack, with 'on'
• Urged to attack, with "on"
• Urged to attack, with ''on''
• Commanded a dog to attack
• Told your dog "Attack!"
• Made to attack, as a dog
• Prompted to attack, with "on"
• Urged to attack