In the seriesEdit
- Main article: Blood Rites
Blood Rites opens with Harry rescuing a liter of Tibetan Temple Dog pups for Brother Wang from an abandoned old school building chased by monkey-demons with black wings and flaming poo fire-balls (Ch. 1, Blood Rites). Later, Harry discovers that one of the pups has stowed away in his car when squeaky growls a warning as a vampire approaches the car. (Ch. 2, Blood Rites). It’s too late to return the pup, the contact number for Brother Wang has been cut off. In the end, Harry adopts the pup, naming him Mouse. 
- Main article: White Night
In White Night, when Anna Ash’s apartment building was on fire, and all of the residents were asleep because of a mild sleeping spell, and the Ordo Lebes women were trapped in Anna’s apartment due to a predator who's been stalking them is outside of her door laying wait—Mouse lets out with an extremely loud “WOOF” repeatedly and with mechanical regularity. The scale of it was similar to a Civil Defense storm warning and blindingly loud when near it. Harry describes it like a flood of sound, a solid living cascade that rattle your brain. All of the residents awoke and vacated safely without panic. The Ordo were able to escape with the evacuation. 
According to Bob the Skull, a Temple Dog is the scion of a celestial being called a Foo Dog and mortal canine. They are mostly sentinels. They keep an eye for dark spirits or dark energy, guard the people or places they’re supposed to and alert to dangers present. They are intelligent, very loyal, tough, and can seriously kick ass. They are not bullet proof; they can be killed like anything else.
TEETH: Temple Dogs can sink their teeth into entities that are spirits.