Related Clues:
- Called from the pasture
- Protested to a veterinarian, maybe
- Grunted like a pig
- Laughed heartily, maybe
- Participated in a stock exchange?
- Sang part of 'Old MacDonald'
- Communicated like a cow
- "Talked" in the cow barn
- Made noise on a dairy farm
- Made a cow sound
- Produced a low, sullen feeling, we hear
- Imitated a 29-Across
- Involuntarily made noise while laughing, perhaps
- Showed appreciation for a bad joke, maybe