Hi, I have 4 months Gdane "puppy", now grown well. He is otherwise perfect but he resists training. He possibly tries to ignore or challange me if I give commands. He has learned sit and down commands, but doesn't respond to "NO" and continues his actions especially like climbing on our bed, trying to nip on sofa, picking up sofa cushion, pulling on pants. I have to physically remove him or stop him doing so. he also doesn't stop bitting hand while playing - If I say a firm NO - he resumes after fraction of second. He can't be distracted towards any of his toys which are good ones. He doesn't play with them alone. I have to play with him, only then he plays with the toys. In the lawn, it is virtually impossible to stop him from picking plants, even if I remove, he reaches there within second, as if he won't care.
One example is - when we are sitting on our bed, he tries to climb on, I say a firm NO, he continues. Then I push his front paws down on floor (he is only half on the bed by that time) he comes again or comes from the other side of bed.