They appear to be roughly as large as lions and serve a supporting role to the Hunters. On one occurrence a Hunter can be seen leading a Hound with a energy leash around his neck. When attacking, they can knock Tommy around and temporarily impair his vision. They can also rear up on their hind legs and walk on them for better striking. These creatures began their lives as normal animals, but they were mutated, changing not only their physical appearance, but ramping up their instincts as well.
Hounds look like a cross between reptile and lion. They have smooth heads and no visible eyes. They posses a short legs and tail.