A miniature Staffy that fatally mauled a Dachshund has been saved from being put to sleep after the council announced the end of its investigation.

On November 5, the Dachshund named Coco was let out of its Pakenham property with two other dogs and ran up to Hero the Staffy with his owner in a park.

Coco's owner, Kashila Chintamunnee, said the Staffy "held on for 10 minutes," and the Dachshund later died from her injuries.

Hero the Staffy mauled Dachshund Coco to death. Credit: 7NEWS

While the incident divided the public, many jumped to the defence of Hero, with a petition claiming he was "defending himself and his family against 3 dogs attacking him."

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The petition has garnered almost 300,000 signatures.

On Wednesday, the Cardinia Shire Council confirmed the investigation into the incident was completed and "no further action would be taken".

"Council can confirm that in line with its legislative responsibilities under the Domestic Animals Act 1994 it has concluded a thorough investigation of the incident that occurred on Tuesday 5 November 2019 in Pakenham," a statement to 7NEWS.com.au said.

"Council will take no further action as a result of the investigation into the incident."

Staffy owner Paki Harrison read a statement on Wednesday afternoon. Credit: 7NEWS

The organisers of the petition thanked supporters online after the decision.

"We can't express enough how thankful we are to each and every one of you and the Harrison family feel the same way," a post read.