Packhounds are pets of Incubusss and Succubuses.  They appear in Beautiful Darkness accompanied by Hunting.  Packhounds are trained to go for blood as stated by LivEthan describes them as demonic Saint Bernards. 


It is described as a rabid-looking animal that had the huge muzzle of a Saint Bernard and sharp, yellow eyes instead of big and droopy.  The hair on their backs bristles like a wolf's.