We will be bringing Pip home this weekend. He is 16 weeks and 2lbs 12 oz. We have two cats, Maverick and Goose. Mav is 11 months old and Goose 10 mos. What is the best way to introduce Pip to them? Neither of the cats are de-clawed, but they aren't aggresive at all. We want to do this in a way where none of them feel threatened or get stressed out. Thank you!