Ruff Ruff, Bock Bock, Quack Quack

Now days Luke is babbling and starting to say many words. His consistent ones include Nigh Nigh (for night time), daddy and doggie. He also loves to make animal sounds. He can bock bock like a chicken, quack quack like a duck and ruff ruff like a dog. :) Below is my attempt to get him barking like a doggie.