The Pathfinder Society blog yesterday on (every Monday, if you weren't aware) has a very handy article on animal companions and how they are "handled":

There are many misconceptions about animal companions (especially if their intelligence is raised above 2 - which is mentioned in the above article) and they often end up being used as virtually another PC in the party, with handle animal checks waved and them doing far more than they should actually be able to.

Anyone involved in Pathfinder, be they a GM and/or player should read through the above article... Thanks!