Your dog has gotten something positive out of jumping, or he would not do it. Many times this is the result of the dog being allowed (and even praised) for jumping when they were a smaller puppy because it is very cute for an adorable off balanced 10 lb lab puppy with big ears to jump on you (obviously it does not hurt and who can resist a cute puppy). However, when this tender faced, fat cheeked, ball of fur turns into a 70 lb dog with real toenails…it is no longer cute or pleasant. This dreadful behavior got them so much positive attention for so long, and suddenly when the humans start to “ignore” the behavior….the dog is thinking, “oh, they must not see me, let me jump a little higher”.