My puppy is 12 weeks old. We adopted her at 8 weeks from a shelter. Within 48 hours she was very ill and diagnosed with parvovirus. She was hospitalized for 5 days and made it!!!! Now, she can be sweet and loads of fun, but at certain times she gets mean and growls and bites at us, especially the kids. She does not like to be picked up which can make dealing with steps difficult. If she's been uncrated for awhile, I think she's tired so I'll crate her. We've also tried the yelping technique when she bites at us. And I use redirection when it comes to things she can't have. What am I missing? Oh, she will have nothing to do with the leash. She attacks it.