Badger (The Devil of Winterborne)
From Tardis Wiki, the free Doctor Who reference
Badger was a dog owned by Barbara Taploe. He lived with her on the grounds of Winterborne School and was doted upon by her. He was killed by Christian Purcell (possessed by Isaac Greatorex) as part of a ritual and was found by Andrew Powell, Luke Pendrell and Georgie. They later showed the body to Mrs Taploe. Christian had kept Badger's collar, which was found by Mrs Taploe, forcing him to kill her to keep his secret. (HOMEVID: The Devil of Winterborne)