Psi-Hounds
Psi-Hound is the official name for the Dog-boys. Psi-Hounds are genetically mutated dogs. They are mutated into a near human form with fully articulated hands and voices, and full bipedal stance. They are the miracle of the Lone Star Facility.
Dog-boys come in several breeds including german sheppards (the most popular), bull dogs, terriers, and dobermans. The process they are created by is not perfect but most abnormalities are non-fatal/non-debilitating and include such things as funny coloured fur, no fur, size differences (dwarves, brutes) or different psychic abilities than normal.
The Dog-boys are used by the Coalition as psychic bloodhounds. They are also used as cannon fodder, and with a few select breeds as shock troops. They work together in teams called Dog Packs. They are loyal troops and get along well with people. They do share a special bond with Psi-Stalkers though, seeing them more directly as leader of their Dog Pack, than they do normal humans. So that is why Psi-Stalkers are the most common pack leaders.