Hello Everybody. I'm new to the forum and looking for some guidance. I've recently rehomed an ex Guide Dog who was removed from his training programme because of his hyperactivity. He has already been rehomed once but was returned back to Guide Dogs again presumably because of his behaviour. I've had him for four weeks and he is settling in but has shown a couple of worrying traits. For example, this morning when we got home after his hour walk - off lead with lots of activity, we started to play a game of 'tug' with one of his toys. He suddenly seemed to just lose it, becoming very boisterous to the point of aggression, throwing himself at me and barking furiously, he even managed to catch my hand in his mouth when jumping at me. He ignored my command and kept lunging at me so I went indoors and left him. He then started running round the garden in a frenzy before returning to the door to be let in. He went straight to his bed and stayed there. He has done a similar thing before and it is really scary. Fortunately there aren't any children in the house or it could have been a potentially dangerous situation for them. In an attempt to understand what is going on, I have asked the Guide Dog people why the previous people returned him to them but they have not responded. A vet check was fine. He's a lovely dog in many ways but is very hyperactive when out on the lead especially when meeting other people or dogs when he lunges at them, not aggressively but because he is excited. I'm working on this with him, taking him to dog classes at which he is getting better, but this manic behaviour is a worry. I have had big dogs before but not a Lab. Can anyone give me any advice here; it would be most appreciated.