An ACT police officer who was captured on CCTV firing capsicum spray at a tethered dog will undergo formal counselling and re-training following an internal investigation.

Footage revealed in June this year showed an officer firing the spray in the direction of the dog before throwing a stick at it.

The incident occurred during a police raid in May.

AFP Professional Standards found that the officer used excessive force and was in breach of the AFP's Code of Conduct.

But ACT chief police officer Rudi Lammers said the investigation found there was no evidence that the dog was actually contaminated with OC spray or injured in any other way.

He said no criminal charges would be laid against the officer in question.

Mr Lammers said the RSPCA would be involved in the officer's re-training and in further training for officers in dealing with animals.

"I am well aware of the significant feedback and concerns expressed about this matter," he said.

"The AFP takes allegations of misconduct by its members very seriously ... ACT policing does not condone or tolerate cruelty to animals in any form."