Jove

In two episodes back, we noticed Sam was running naked through the woods, which may indicate he is a form of lycan, possible werewolf, since he has a connection with the dog.

It is possible that Bill is a master vampire and his animal to call are the canine or werewolves, so whenever Bill is protecting Sookie, the dog is near.

Also, I found it odd how Sam was crawling all over the dead girls bed smelling her sheets.