Hound Types
There are two types of hounds: Storm Hounds and Hell Hounds. There is both a physical and a mental/emotional difference between Storm and Hell hounds.
Hell Hounds are considered the typical Hound of Abaddon. They're associated with the element of fire, and are able to manifest and manipulate fire. Animaux, the mascot, is a Hell Hound. They are typically calmer than Storm Hounds, and usually much more wise, mature, and more intelligent. People wanting companions or tracking hounds usually always choose Hell Hounds over Storm Hounds. Storm Hounds, naturally, can produce and manipulate electricity. They are no more or less common than Hell Hounds, but they are rather dangerous in comparison. They are high energy hounds, and are typically used when hunting down speedy prey, as they are very quick. Storm Hounds have horrible judgment, and can often end up in trouble. The majority of Storm Hounds are considered to be clinically insane. Storm Hounds usually have black horns.
I'll expand on both variations at a later date.