First, congratulations on your pup. He sounds great. Give him time to mautre and I am sure you will see a huge difference in attitude and guardiness. Stacey is correct, the book she suggested is a great one and has alot of valuable info. I would suggest that you start teaching your dog a few basic commands. Letting him chase or play too rough with the livestock is not good. I use the "Leave It" command with my dogs. Be firm with him. We currently have working for us, Estrela Mountain Dogs, Anatolians, a Tornjak, a Gampr, Akbash, and Karakachan. We will soon be adding a Central Asian Shepherd and an Aidi pup. Good luck with your dog.