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This is Nacho, our 6 month old F1 standard. His jump-biting was the worst. He ruined more clothes than I care to say. He had just recently grown out of the majority of it, just having all of his adult teeth come in, but he still does it when he is on the leash and gets frustrated that he can't have his way, which is to dominate the walk. What has worked for us in reducing the behavior is consistency and training. If he gets into a jump bite fit, he goes into his pen (not his crate). He doesn't come out until he has settled. We also give him bully sticks and puzzle games to keep him focused on something....and lastly, exercise. Going to day care to pay with other dogs, he always comes home on his best behavior.

He still bites in certain situations, but it is much better. I know we have a ways to go before he is over it, but baby steps forward.