Related Clues:

• Do a line of
• Jiggerful
• Sound heard at the track
• "No" vote from a horse?
• Sound akin to 'Harrumph!'
• Sound from the bull pen
• Cry of a horse
• Nag's outburst
• Bar shot
• Wooden shoe's sound
• Bullpen sound
• Cart horse sound
• Sound by the bay
• Bull pen sound
• Sound that might accompany 37-Down