Our Bonnie is peppy and happy, most of the time, but can become timid and anxious. She has occasional gastritis where she eats grass then throws it back up (with heaving) vomiting grass and clear mucus. She eats a diet of limited ingredient food for small dogs mixed with a little bit of my homemade food. Both are vitamin-enriched and tummy-friendly. She tends, also, to eat very fast. Has anyone had luck with the Gentle Eater bowls in slowing a gobbling pooch down?