Yep, agreed with Anon101. When you say he “goes mad”, is it silly, over-excited behavior (typical of *young* Goldens!), or aggressive behavior? Any sudden changes in behavior means it’s vet time. Goldens can be notorious for health problems showing up early. If he’s randomly showing aggression, I would speak with your vet in depth about a proper thyroid test and having a CBC ran. If it’s a young dog showing problems with impulse control (meaning, the dog prefers to leap at someone in over-exuberance and land on their head in order to say “pleased to meet you” because they just can’t help their excitement,) I’d talk with a good trainer. An in-person trainer with good credentials, a good reputation, and a good head on their shoulders will be able to evaluate what’s going on and be right there–in person– to help you.
