James (John Travolta) and Mollie Ubriacco (Kirstie Alley) are expanding the family again, this time with Rocks the mutt (Danny DeVito) and Daphne the poodle (Diane Keaton), a mismatched pair who spend their time trading insults the humans can't hear. Meanwhile, James gets a big break working as a private pilot for cosmetic tycoon Samantha (Lysette Anthony), but his employer is determined to pry him away from his wife, his children and, of course, his dogs.