I've meant to buy it for my mother since she still terribly misses our dog who died somewhat recently. Played only a bit but what little I could get from the game is that it's got the whole virtual pet thing and it works great, if you're into that sort of thing. Teach him how to do tricks, make him wear accessories, care for it, then it's on to some kind of championships where he competes. The gimmick seems to last long enough for most but the repetition of the tasks does tend to annoy, though this depends on the player. I'm sure some won't have any problems replaying the game to unlock the dog races.
Can't tell you more than that, sorry.