The game, though, raises some small complaints based upon what was shown at the demonstration at the 2011 E3 Expo.  While there are a number of different breeds of dogs and cats (the horses were not show, only mentioned) — not all breeds are included in the game.  Sure, there are probably more breeds of each than the programmers wanted to include, but even common and popular breeds like Pit Bulls are absent.  Also, real life pets these days are no longer commonly restricted to just the three genus that are included in the game.  Pet lovers that would like to adopt ferrets, chinchillas, rabbits, and others are being left out of the fold.

article here (thanks SimsVIP!)