Dog barking at cats for nothing, how do i stop it?

ok so if my cats are sleeping or sitting somewhere my puppy will come up to them and start barking at them or nothing and then my cats are like wat the farrrrrk get away from me and then they will hiss and claw her but even after they do that she still goes back and starts barking at them( and she is a maltese x poodle puppy and her bark is kinda annoying) when she is barking at cats, how do i make her stop so her doesn't get really hurt? and also sometimes she smells her buts do u think she thinks they are dogs and she wants them 2 bark at her?