About 14 months ago we put down grass seed where we had done some digging and excavating. It is where my goats can reach. I did not know any better and used a golf coarse grass seed. Well, it finally started coming up this year, and someone told me that I should kill it with spray as soon as possible or the "fescue" in it could make my goats really sick and even die. Is this true? What is the best way to get rid of it? Could my goats already be sick?