It depends on what they actually are trying to do.
Is Cat attempting to find yarn? Is Dog trying to play with a bone? If both are happening, they're not really moving in either direction.
he's going neither because you can see by cat's two paws, one of them is on a step and the other isnt- the frield of depth is all wrong and it looks like dog is on the bottom part of the stairs but cat is instead hanging over the edge of the stairs.
Is Cat attempting to find yarn? Is Dog trying to play with a bone? If both are happening, they're not really moving in either direction.