ya i heard about that... like it is really weird... i wanted to see it... but i never did...
aparently it has a lot of violence and sadism in it... even though it is about animals it is definatly NOT a kid show...
Apparently there is an anime too... it might be interesting to check out... the OVA isn't required for the anime of vice versa if i remember right but both are really good if you like that kinda thing...