When a dog jumps on a human of its own free will, it is not "greeting" the human, it is asserting its dominance over the human; it is the dog communicating that it is alpha and/or wishes to own/control the human. A subordinate would never dream of running over and jumping on the alpha dog of the pack. Space is respect and lower members of the pack respect the higher members. If your dog jumps on humans, it does not respect them. Note: when a young puppy jumps on humans it is sometimes its attempt to reach one's face. Puppies need to be taught not to jump up on humans as this behavior will manifest into other meanings as the puppy grows up into an adult dog.
If a dog is stressed or afraid, their demeanor and typical behaviors will change. If you see this in your dog (or really any dog you know) you should step back and check on your dog. Are they hurt? Did a new dog come around they don’t know? Has the weather changed? Is it hot outside? When was the last time they had a chance to go outside to pee or poop? 
1. Do not let your dog make a big deal out of your arrival home. In fact, as the alpha leader of your family's "pack", you shouldn't even greet him or her for at least 15 minutes. If your dog jumps around and pesters you before that, squirt him with water pistol or shake a can filled with pebbles. This will startle him, and if done on a regular basis, calm him whenever you get home. He won't make such a big deal of your arrival, and thus learn that he can greet you without jumping. Follow the same technique for any visitors to your home. Do not introduce the dog to your visitors until after 15 minutes or longer.
1. Do not let your dog make a big deal out of your arrival home. In fact, as the alpha leader of your family's "pack", you shouldn't even greet him or her for at least 15 minutes. If your dog jumps around and pesters you before that, squirt him with water pistol or shake a can filled with pebbles. This will startle him, and if done on a regular basis, calm him whenever you get home. He won't make such a big deal of your arrival, and thus learn that he can greet you without jumping. Follow the same technique for any visitors to your home. Do not introduce the dog to your visitors until after 15 minutes or longer.
Puppies in human households try to lick the weird, flat, usually bald body part we have instead of a muzzle. When a cute little puppy jumps up to lick face, many people can only say “Awwww!” Hey presto! Jumping up has been rewarded. The puppy’s natural inclination is now a learned behavior. Too bad for the dog when he’s nine months old, bigger and less cute, muddying the pinstripes and knocking Granny to the ground.
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