Hi My horse Duke somehow got hold of a bag of Mare and Foal starter feed. The bag was almost empty and had about 5 lb (give or take) in it. He ate it all up. Is 5 lb dangerous? The vet's clinic is closed so I couldnt call the vet until tomorrow. What should I do? I built a makeshift "feed room" in the barn and he must have pulled the bag out because it was so light.