Size and Type: The base creature’s type does not change, but the creature gains the shapechanger subtype. The lycanthrope takes on the characteristics of some type of carnivorous or omnivorous creature of the animal type (referred to hereafter as the base animal).
This animal can be any predator, scavenger, or omnivore whose size is within one size category of the base creature’s size (Small, Medium, or Large for a Medium base creature). Lycanthropes can also adopt a hybrid shape that combines features of the base creature and the base animal. A lycanthrope’s hybrid form is the same size as the base animal or the base creature, whichever is larger.
另外,兽化人还有+2/+3的LA,并不只是损失1个HD。