My puppy is 9 weeks and is biting at my legs and barking. I’m concerned that she’s trying to be the boss. Any insight would be appreciated.

My puppy just turned 9 weeks old and she has recently started barking and trying to bite at my legs. I can't decide what it is she's is wanting. It can happen at times when we are doing something she doesn't want to do, like walking away from something she was trying to eat. (which is everything outside). My response is to stand and tell her nope and if she continues I will put her either in her crate or expen. I've also been trying to direct her to playing tug, which she will do some but not every time. My biggest concern is she is trying to be the boss and I'm trying to do everything I can to assert myself as a pack leader or she could just be being a puppy. Any insight you could send my way would be so appreciated. Thank you!

This is great, thank you! This resource of asking questions is so helpful for me as a new dog owner!