I have a working strain of deerhound he is 18 months old , has killed a few foxes with other dogs the only thing i can knock about them is their pace. maybe he will get faster when he learns to course properly but big game is not slow and you need a special dog that has the size, power ,determination, speed and techinique to pull down a stag single handed. Only seen a few and they are rare. So ill have to see how he gets on. A deerhound bitch could be a better option.