thank you all. I really don't have any problems with Dylan's hyperactivity at all. What worries me is never being able to have him around children. At the moment m little nieces and nephews are avoiding visiting because they're scared of him, which is a real shame as they love puppies at tha age. He pounces on them and goes for their faces. He gets excited, I try to pick him up to take him away and he goes absolutely berserk! Family members who know dogs have expressed worries over his behaviour, as he is like something out of the exorcist with head swirling, barking, growling, trying to bite anything and anyone etc and throwing himself against his cage and biting it when i put him in. he is even like this when i take him to the park, he's off the lead, starts running around, gets a bit excited and starts going for me. he's jumping up, lunging, biting snarling an growling. Hits bites go very deep, i now have quite a few deep gouges in my hands,arms and legs. the only thing to do is to hold him tight and stroke him and whisper to him until he calms, it's like once he reaches a certain level of excitement, he goes into a complete uncontrollable frenzy. these incidents are becoming fewer, maybe only a couple of times a day now, i'm unsure if this is down to the amount of taining we're doing or his age. i won't have him castrated unless he doesn't get any better and there's a very high chance that it will improve things.