There is a long history of cats and dogs being used in art with the artist often parodying human behavior to bring humour to their work.
For example The Bachelor Party... by Louis Wain.
and Waterloo… by Cassius Marcellus Coolidge
Neither works were accepted at the time as being 'serious' pieces of Art but are accepted as such now. The same with many LOLcats creations now which only goes to show that art does not need to be serious or involve paint on canvas.