This content comes from Monsters of Porphyra

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Arglolf
Savage and intelligent this two-headed canine is able to have one head watch as you approach while its other head gets some sleep.

Arglolf (CR 3; XP 800)
N Medium magical beast
Init +2; Senses darkvision 60 ft, low-light vision, scent; Perception +10
Defense
AC 15, touch 12, flat-footed 13
(+2 Dex, +3 natural)
hp 30 (4d10+8)
Fort +6, Ref +6, Will +2
Offense
Speed 40 ft.
Melee 2 bites +6 (1d6+2 plus grab)
Special Attacks doppler bark
Statistics
Str 14, Dex 14, Con 15, Int 3, Wis 12, Cha 10
Base Atk +4; CMB +6 (+10 grapple); CMD 18 (22 vs. trip)
Feats Ability Focus (doppler bark), Skill Focus (Perception)
Skills Perception +10, Stealth +6, Survival +5, Swim +6; Racial Modifiers +2 Perception
Ecology
Environment plains, hills
Organization solitary, pair, or pack 5-10
Treasure none
Special Abilities
Doppler Bark (Su) As a standard action, the bark of an arglolf acts as a 25 ft. cone sonic attack that dazes its prey. Anyone caught in the cone must make a Fortitude save (DC 16) or be dazed for 1d3 rounds. The save DC is Constitution-based.

Hearing the howls of canines of many types is common in the night, but hearing a fearsome bark echo unto itself can chill the blood of the most dauntless warrior. The possessor of this infamous bark is the arglolf, a two-headed canine common in the plains. Bred for war, the arglolf is well-suited for bringing down mounted prey, and its two sets of jaws can make short work of most targets grounded so. They make the perfect watchdogs, as only one head need sleep at a time, though the beast cannot move about while one head is sleeping. A well-trained pair of arglolf can corner a target, single it out, immobilize and kill it quite quickly and efficiently.

Within a domesticated pack, the arglolf kept by the dominant hobgoblin is the leader, and beast deferred to by the others; arglolf are more intelligent than common animals, and better able to distinguish the social structures of others. This intelligence, coupled with a keen social sense, also causes arglolf to leave indolent masters, and found wild packs in the wilderness. These packs recognize no master, and quickly dominate a large area of their chosen territory, often lightly forested hills.

Legends tell stories of further mutation or experimentation on the arglolf, giving rise to rumors of pack leaders with three heads, gaze attacks, multiple eyes, and other gruesome variations.

On Porphyra
Arglolfs are found in small packs wherever wolves are found, including white-furred specimens in the Northlands. They have been domesticated (to a certain degree) by the hobgoblins of Parl Pardesh, and to a lesser degree by hobgoblin tribes of other lands.