Vinegar and horses?

Hello Dr. Dan

I would like to know if it is safe for the horses, to add 1/2 to 3/4 of a cup of cider vinegar to their grain each day?

I have heard that is has many great health benifits for them. A friend of mine told me I could come here and ask you and you would be able to help me.

Thanks so much,
Nancy Jane

I have heard good reports too,  BUT it concerns me how the acid could change the pH of the gut and as you know the gut is very sensitive to say the least.

Thanks for asking!