"We have identified the officer, because there was a complaint that was investigated and has translated to a disciplinary investigation," station commander Brigadier Sandile Sonjani told News24.
Sonjani said the disciplinary hearing would take up to 30 days.
On March 2, News24 reported on the massive outcry on social media shortly after a video of the incident started doing the rounds.
At the time, Dr Mpho Hlalele, general manager at the Animal Anti-Cruelty League (AACL) in Epping, confirmed that the animal was brought in by its owner. She would not divulge any further details at the time.
However, on Tuesday, Hlalele confirmed that the dog was put down due to the severity of its injuries.
SPCA spokesperson Belinda Abraham, had also told News24 at the time that the culprits were guilty of contravening the Animal Cruelty Act on two counts - first, by causing harm to an animal and secondly, by not seeking help for its injuries.
WARNING: GRAPHIC FOOTAGE