How do you keep a dog from jumping on you and barking all the time (in a humane way)?

My sister brought her dogs here because she's staying in a motel due to being homeless. One of her dogs is a pit bull. He is friendly, but loves to jump on me and my housemate. His toenails are so sharp they are causing scars and cuts on our arms. He also barks all the damn time like nonstop. How can we calm him down? It's getting to the point I can't even think in silence anymore.

How do you keep a dog from jumping on you and barking all the time (in a humane way)?
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