Gee, a 9-week-old puppy biting everything! How unbelievable! (Lol)
I’m going to go against “conventional wisdom” on that issue. I’ve never discouraged my pups from biting. Biting TOO HARD, certainly. But a dogs mouth is its hands. Anything they want to interact with, it HAS to be using their mouths. Over time, my pups became super soft-mouthed, but they still bite me. These days, I’ll put my arm along the side his head, and he “side nibbles” my forearm. Secondarily, he’ll flop over on his back on the couch, and curl his head back toward me. I’ll reach out with my index finger and touch his nose. He’ll let me do that a time or two, then snaps, trying up to catch my finger before I can pull it away.
We play these games for hours. He’s quite the character.