Well, years ago a trainer suggested a knee in the chest for my American Eskimo, but this didn't phase her one bit. So I don't really feel this method is very effective in very hyper dogs really... and that seems to be your case.

Our current trainer told us to immediately say "off" in a firm voice and turn our backs on the puppy until she is down on all 4's, at which time, we immediately turn around, praise her and say "Good off" in a pleasant tone.

Kneeing a dog down, or yelling at them no, without doing anything else is still a form of attention, even if it's negative. The idea here is to "remove" the reward for jumping up, which is to turn your back and ignore the dog until he does as you want.

The hard part is getting family and friends to help you on this. More than once I have had someone say to me, "oh, it's okay, she's just excited". Okay, sure, that person doesn't mind, but what about someone who does. I have had to persistently remind family and friends how to handle the jumping up situation to help us discourage it all together. If you allow it sometimes, it sends mixed signals and confuses the dog as to what you want of them. It's VERY IMPORTANT that you ALWAYS address the jumping behavior each and every time.

This has worked well with our Border Collie puppy and tho it does take time to accomplish (so be patient and persistent) it will work. Putting your dog in a sit is a very good thing too and is something you can impliment once you have the jumping more under control.

Also, never step backwards to get your dog down on all 4's as you are "allowing" him to have your space and as an alpha pack leader, you shouldn't allow this.

It depends a bit on how old your dog is, and how aggressive. Here are a few tips I've seen and/or used:

For puppies, simply stick your knee up (bending it) so their chest knocks right into your knee. After awhile they get tired of getting knocked in the chest and quit.

For older, more aggressive dogs (not vicious, just dominant): make sure they're on a short leash when someone comes over. Put the leash on the floor. When they start to jump, say "NO" loudly and firmly, while stepping on the leash. They'll be getting pressure on the back of the neck plus your voice. The pressure on the back of the neck is dog body language that means "You shouldn't be doing that!"

You can even have a series of different friends come over just to do this with your dog. Try it for a couple of weekends, or other times when you're going to be home 2-3 days in a row where your friends can come over and help you with this.

You can even take this a step further and immediately after telling him "no", tell him "SIT" in the same loud, firm voice, and sweep his hind legs out from under him with your hand so he has no choice but to sit down. This will not only train him not to jump when someone comes over, but train him to sit.

Once he's good with this at home, try it on walks, again, with some friends helping. Soon he'll get into the habit of sitting down when you stop to talk to someone, or when a friend comes up to talk to you.

My girlfriend and I took our basset hound to puppy training and this was one of the problems we had with him. It was especially an issue because of how low to the ground yet heavy he is; when he jumps he knocks your knees out from under you!

Her advice was to take a metal or tin can and fill it with pennies, beans, etc. and seal it. Then, literally practice coming and going in and out of the front door. Take the can with you and go outside. Wait a minute, then go back inside and in theory the dog's excitement level will increase, and they will likely jump to 'greet you'. As soon as they do, shake the can once in their direction while taking a step towards them and saying 'NO!' This will likely shock them and get them to immediately jump down.

Do this a few times in a row, and practice it a couple times a day. You will find that gradually the dog will jump less and less, until you don't have to worry about it anymore.

Good luck!

Put change in a can or slap them with a newspaper when they do it

I am an avid watcher and believer in most of Cesar Milan's techniques and dog psychology know-how. So, what he explains in the case of a puppy/dog jumping up at people is when they first enter the room or house have them ignore the dog, yes ignore. Like the dog isn't even there, until they are completely within the household. During this time you should take claim to the front door and made the puppy sit elsewhere while you let the person in. No, this does not mean right next to you, or holding them back, it means a good five feet or more from the door.

If the puppy continues to do this lightly "bite" him on the neck with your fingers in the shape of a claw.

If that does not work you need to put him on his side on the floor, holding him down so he can't get free. He will freak out at this, but do not worry mother dogs do this to their puppies when they get out of line. It is a form of dominance, and being the pack leader you need to do this. Your dog will whine, bark, yelp, howl, and possibly even growl. You need to keep in that position until he completely calms down and relaxes. No tail wagging, droopy ears, not struggling, simply laying there awaiting permission to get up.
Hope this helps!

I agree with much of tracebooks response but will add...

Ignore the jumping, turn away, walk away.

As long as no one is getting hurt - ie small kids or elderly, have people turn away and/or cross hands at your chest and otherwise ignore the dog when they jump on you. This is an 'extinguishing' technique. You may find that this works really quickly to cease the behavior.

So often they get rewarded from jumping because you must touch them, handle them, pat (push) them to get them off you. Inadvertently you are teaching them that they jump and they get attention.

As soon as they put all four feet on the ground you can turn back and give them some verbal praise. But, not too much 'yay, good dog' - because these jumpers are excitable pups, so they will likely jump up again, keep it low key.

Teaching the sit or down is a great addition to help control this behavior - a sit or down gets the calm praise/attention - NOT the JUMP.

Also, be sure your dog has a chance to get enough exercise and socialization for his/her breed type and personality. This will help in all behaviors and training.

Good luck!