Dr. Deaton

The Veterinarian (unnamed in the series) is Scott McCall’s boss at his after school job at the Beacon Hills Animal Clinic.

IMDB does not list a character name but has been updated to say that actor Seth Gilliam is playing him.

Sheriff Stilinski has sought out his help and advice on two occasions in the ongoing investigation of recent animal attacks.

In Heart Monitor Derek Hale becomes convinced The Veterinarian is The Alpha after the doctor lies about a dead deer found with The Spiral burned into its side. Derek attacks and knocks the man unconscious, ties him up and dumps him into the back seat of his car.

The Veterinarian disappeared just before the Alpha appeared at the end of Heart Monitor but reappears seemingly unharmed at the end of Night School. Scott asks him how he got away but he is vague in his response.

In Co-Captain he finds Scott and takes him to the Animal Clinic to remove the bullet. He says treating animals is only part of his work and suggests that he has treated werewolves before.

In Formality It becomes clear he has knows enough about werewolves to ward off attack. Peter Hale is unable to cross the bar into the back of his clinic. The bar is made of "Mountain Ash". This angers Peter who smashes a chair against the wall but the Vet doesn't flinch.