Oh man. The graphics in this animation, they're perfect for the story you're telling. The joy the dog experiences by having no-one tell him what not to do, until realizing that he's alone is a real nice interpretation of the theme.
Animations were a bit jerky at times, but I can't find much else to pull you down. I loved the use of music in it. Works well with the naivety of the dog on its own. The switch between the moods felt a bit out of place, though.