I have a 7 month old German Shepherd puppy. He is the typical 7 month old. Extremely active and into everything . I try and take him on a mile and a half walk off leash everyday but I work for myself and am not always able to take him. I do auto paint and body work and let him be outside with me while I work so he can get exercise. I have had him since he was 8 weeks old and have trained him where he knows several commands and was easy to disapline until recently. He is pretty large for a 7 month old. He is 28 inches at his withers.His dad was 150 pounds (not heavy set, just large). He goes at everything 100 mph. He is alway biting my hands and its almost impossible to work around him. He thinks everything is a game and always wants to play. I will tape and paper a car and he will pull the paper off and try to pull the tape off. He has torn up all the wheel cover I have. He tears up tarps I have hanging.up. Anything he see's me with he wants. He tore boards out of my neighbors privacy fence. He tears up my electric and air tools. Last night he ate my motorcyle seat. He is just a handful. I love him to death but he is wearing me out. He can be very affectionate at times. I will be sitting down working and he comes and jumps in my lap and will start licking my face which I dont mind because I know he is showing he loves me also. I have read that I am not supposed to yell at him or try and punish him. I will admit I have yelled at him once in awhile because he is agravating me so. I tell him no a good bit and he seems to understand what no means. Am I in the wrong telling him no? Its just so agravating trying to work and he is doing everything he can think of to keep me from working. I do not want to shut him up while I work because at least he is using up some energy being outside with me. Its hard to stop working to try and turn his attention to something else. I am always overloaded with work and work 7 days a week. I just need to know the best way to disapline him without causing problems that will effect him later in his life. Also I read that from 7 months to 1 year is when German Shepherds are the hardest to deal with. But will it slack up at all in the coming months? I had a female German Shepherd from the time she was 8 weeks until she passed at 13 years. I dont remember her being non stop excitement the way my 7 month old male is. She was a real sweetheart. How do I let him know that what he is doing is not acceptible behavior?