Hi all, I'm looking for advice. My golden retriever is now 6.5 months. For the last few weeks every walk I take him on...on lead/off lead results in him leaping at me/growling and biting. The biting hasn't broke my skin but I'm bruised and sore. It can happen at the beginning or end of walk. New places or regular places. Sometimes I can see it starting...other times its like he just switches. I've tried running him in our field first/playing ball, find it etc before lead walks but it makes no difference. Today I let him off lead in the field and within a minute he started. I've tried shorter walks/exercise but he still does it. It's like a vicious circle as I want to exercise him to tire him but he does this every single time. We do training/brain work regularly during the day. His impulse control is pretty good. I can leave the outside door open and tell him to stay in the house until I release him etc. I live with my elderly parents and he started to behave badly with them today. Barking/jumping/mouthing and humping! I work from home so I'm always around but he does settle in the kitchen if left alone. I'm just drained at the moment and dread each day. He does have positives but this behaviour is becoming too much.