When Otto (German Shepherd;, now 10 mos) was 7 months, he started jumping on me when outside and biting my arms and legs. I took him to a trainer who gave tips on controlling him and then bringing him inside for a "time out". For a while he was much better, but in the past two weeks the behavior has resumed. He is big and strong and trying to grab his collar to say "No!" only makes him bite my hand and squirm to get away. I turn my back to him when I see him coming, but he still bites my arms (it hurts!). I have found that carrying a walking stick when outside intimidates him (although I've never hit him, ever), so that is what I have to do. But I don't want to spend the next 10-12 years trying to defend myself in my own yard (he is fine inside). He also does this to a lesser extent with my husband, but he says "it's something he'll outgrow." I'm not so sure. Suggestions?