Your animation skills are way above average but you do right to accept some critique. In my opinion, what your animation lacks is intention. Give the viewer more hints about what he has to think of the characters, of the situation. Guide him to expect something and let him be surprised when something unexpected happends. But always do everything with intention. For example the dog walking on two legs was unexpected, but what do you do with it then?
Other than that: Using real audio sound from a dog is a very good choice, it shows (hears). Your rigging is top. The dog-eye-iris are a bit too big, you can barely see them moving. Exaggerate all movements a bit. Make it more clownesque. Also, to give the viewer a hint of what your intention is, maybe add some simple camera panning or shifting (but no handcam effect, that's cheap). This gives the scene more depth (as it is 3D). Also a bit cheap: The "censored" walking cycle of the dog on two legs, might seem clever as it is less work but is disappointing for the viewer, as he wants to see the legs moving. The colors and shapes in the background are very saturated and clean which is more cartoonish than the foreground, which is unusual. Clouds are moving too slow, no leafs falling, no bees flying, the environment is a bit lifeless.
But you are on a very good road. Hence the stars. Keep up the good work!