Testostrone has hit. Use the old tried and true method. For the next week or two, every time you go out, pick him up, tuck him under your arm and carry him around for at least half an hour or more while you do your chores or just sit down with him. Talk to him, scratch him. My RR Roo, Fergus, was like that. He drew blood, chased the dog and jumped me everytime I went out. After a week or so of the "Cuddle treatment" he stopped. Now when I'm in the yard he follows me like a puppy. He probably will never be as sweet as he was, you have to remember he's an adult now and his job is to police the yard and protect his girls. If that donesn't improve his attitude it's off to freezer camp.