One of Milt Gross' specialties (almost everything he does is a specialty) but he really defines "funny animals".
http://comicrazys.wordpress.com/2008/07/28/pasha-the-persian-illustrated-1936-milt-gross/
I'd swear Jim Tyer must be hugely influenced by Milt Gross. Look at the eyes and smiles. And of course the craziness.
http://www.animationarchive.org/2008/07/comic-books-jim-tyers-funny-animal.html
http://comicrazys.wordpress.com/2008/07/27/dinky-the-amateur-dentist-jim-tyer/
Milton Knight is a modern heir to the Gross/ Tyer school. New York cartooning. Ever see his Hugo comics? Great!
http://comicrazys.wordpress.com/2008/07/13/mighty-mouse-spotlight-comics-1987-milton-knight/
Here are some more classic Gross daily strips - starring funny humans, courtesy of Marc Deckter.
Milt Gross also draws the funniest sausages.