I have two 3 month old Nubian doelings that I'm thinking about training to be pack goats to go hiking with me and my family. I know they aren't old enough right now but when they hit around a year or so. they aren't going to carry heavy stuff just some water bottles, snacks, etc.. one was a bottle baby and the other was dam raised but both are super sweet! So how do I train them to be packers? what all do I need?