We just adopted a mutt from the humane society. She looks part retriever and part lab. They said she is 4 years old but she looks and acts much younger. She's a sweet dog that loves to play. She is very friendly and loves attention. She has a couple of behavior problems that need to be modified and we're not sure how to go about it. She bites hands. We can sometimes get her to calm down and let us pet her where she doesn't see our hands but as soon as she spots them they're in her mouth. They are playful bites, not aggressive ones, but it is constant. They other problem we need to address is her jumping up on us and others. She also jumps up to the counter in the kitchen and the table. She doesn't get all the way up on them, just her fron paws so she can see and possible snatch what ever may be within reach. I'd appreciate any advice you could give on these issues.