Lacey, arr arr, and it is too high pitched. She can also make motorboat sounds , like buh, buh, buh buh.
Layla, definitely woof, woof. She makes siren noises when she wants something one of the other pups has. Like arrah, arrah, arrah, very high pitched, could almost break glass.
Jake, arf, arf, unless he's upset, then it turns to arroooo! He can even howl.