Possible Clues:

• '___ semper tyrannis'
• ''__ 'em, Fido!''
• 'Get 'em!'
• '___ 'em!' ('Attack!')
• '___ 'em!'
• [the spelling's intentional]
• [Quoted verbatim]
• '-- semper tyrannis'
• "No, that's not a typo"
• Attack, to a dog