Jane asks about grass fed horse…

Hello Dr. Dan.

 My horse is currently on pasture grass during cooler hours of the evening/night and supplemented with a slice of hay during the afternoon, as he spends the hot afternoons by his fan under the run-in shed. 

He was previously on a pelleted food for his grain ration am/pm, and with purchase of the #2 product I gradually have converted him to oats, am/pm..

He has also been on Thyro L since having laminitis approx. 15 years ago.  Yes, an easy keeper. 

My question is:

 I saw on the Just Add Oats label that it was primarly formulated for horses on hay as their primary roughage source.

Is this a problem during the late summer months, when grass is the larger ratio of his roughage content? 

Thanks,

Jane in Kentucky

Thanks for asking Jane