I am not saying that Fido should be casting spells, but it does seem like there could have been a beast variant on the expert tract (trained animal or something like that). In addition to the time-honored gimmick of "I trained my pet to help me steal stuff" (I mean the trailers for Aladdin are in theaters now, so it is kind of timely), dogs and pigs can be trained to be better trackers than untrained animals, and I am sure there are a few other things that I haven't thought of.
For a third tract, there could be something like a tiefling or aasimar (or even sorcerer) (Fido discovers he is 1/8 blink dog or something), but powers rather than spells. If dogs had wish spells the world would be drowning in bacon......
