I'm experiencing the same thing with my 9 week old, Maggie. I take her to work with me, and once we get home, look out! She runs from the kitchen, under the table, around the recliners, under the rocking chair, leaps onto my lap and runs back in to the kitchen. Then repeats. Its hilarious but I think she's just getting out all of the energy that she's been holding in all day. Suggestions on the biting would be helpful though...now I know where the "Boston Terror" phrase comes from!!
