Intact male dogs (not neutered) have testosterone in their system. Testosterone causes dominance and sometimes aggressive behavior
. Intact male dogs are generally more unruly than neutered male dogs because of the testosterone in their system. We usually recommend neutering dogs before they reach adulthood. Removing the testosterone from their system before they have a chance to acquire secondary sexual dominance behaviors is the best way to prevent the type of problems you are describing (jumping, unruliness). So, in your case, where your 3 year old intact male dog is displaying these problems, neutering may not be the complete solution to the problem. Since he has already acquired these behaviors, neutering alone is not going to completely take care of the situation. Rigorous training
in addition to neutering is what I would recommend. I would start a program of absolute intolerance of him jumping. NEVER ALLOW HIM TO JUMP ON ANYONE. Anytime he jumps, take his front paws
and place them on the floor. This will likely have to be repeated over and over before he starts to "get it" and learn that jumping is not acceptable. When he does sit quietly, reward him and shower him with attention. It sounds simple but, as you probably know, it will require repeated reinforcement. Neutering will help too but not immediately. It will take some time for the benefits of neutering will be observable. Unfortunately, sometimes even after neutering an adult dog, they continue to display dominant
behavior because they have gotten used to behaving that way. However, neutering him may help in this department. It certainly won't hurt anything. I hope this is helpful. Please let me know if you have more questions about this.