Why Dogs Jump
Dogs jump up on people because they’re excited, they’ve been encouraged to do so or, in some rare cases, because they are being less than friendly.

How to Correct Jumping Behavior
As with most behavior problems, preventing/redirecting the unwanted behavior while encouraging better behavior is an effective plan.

• Practice "sit". Have your dog sit for everything he enjoys in life from food to petting, from opening a door to throwing a toy. Soon your dog will learn to associate sitting with everything good and this will give him something else to do other than jump.
• Don’t reward jumping. If you pet, hug or respond excitedly when he jumps, he’ll think you like it. When your dog jumps, step forward toward your dog and say ‘Off!’ in a low tone. (‘Off’ is the preferred command since ‘Down’ is usually used for lie down.)
• If he puts four on the floor, praise him calmly. Now direct him to ‘sit’ and calmly praise him again. A food reward would be good as well. If he does not respond, try luring him off you with a treat – preferably a piece of his food, – and into a sit. Practicing this can quickly give him an acceptable way to greet you.

For Your Guests
Consistency is key to training a dog. Stand next to your guest and practice your greeting routine with your dog. Practice with dog-loving friends who understand that training takes time. If this isn’t possible with some guests, then prevent the issue entirely by confining your dog when your guests arrive. You can always bring him out later, on lead, when things are calmer.