With werebeasts, they possess a unique virus that basically holds copies of two types of DNA; that of their human self, and that of their animal form. If they’re turned into a werebeast, they will inherit a similar, if not the same, animal as their master. If they are born with the infliction, they’re not quite guaranteed to hold onto the animal designated to them at birth even though their parent(s) possess that form! They can perform a “ritual” that involves hunting, skinning, then donning the hide of the animal which they desire the traits of so that their skin absorbs the physical appearance of the shape the werebeast wants to take on. In order to obtain the genetic make-up and complete the process, however, they must make sure to drink the blood of the animal as well. (I know, it’s morbid, but it’s the way of the beast.)
With shifters, it’s a very different process. They are a species that descends from magic users and, in fact, were once classified as a subspecies of wixen until a hundred years ago! They choose the animal at which they want to imitate and have to meticulously study their behavior. In fact, with the two present in our town right now, they obtained their forms from the animals they best love: Lady Neal with the appaloosa horse, Santiago with the mountain lion. Our version of shifters can be best associated with skin-walkers.