Published Tuesday, 11 September 2012
Two people have been bailed over last month's attack, which left the three-year-old collie with burns beyond repair on 20% of her body.
After speaking to their vet, the Agnews decided the kindest thing for their dog was to have her put to sleep.
Natalie Agnew said her family, including two young sons, has been left traumatised by the cruel injury to their pet.
She has called for those who supported Cody to get behind a petition that would see more people behind bars for such crimes.
Under current laws, those found guilty of animal cruelty could be jailed for up to two years, and the number of people prosecuted for the crime in Northern Ireland is on the rise, from 19 in 2009 to 41 in 2011.
But Mrs Agnew believes a tougher sentence could also deter people from carrying out heartless attacks.
If they had something to fear then I think there would be far less of these cruel acts taking place.
"I don't think they realised the public outcry and outrage," she said of the people who set her dog on fire.
"I don't think they expected half of that, they thought it would be brushed under the carpet, I would say.
In April, new legislation came into force that means local councils have authority over the welfare of pets, while the Department of Agriculture overlooks the care of farmed animals.
But Agriculture Minster Michelle O'Neill said adequate legislation is in place against those who harm animals.
"It's maybe some of the toughest legislation that we have on these islands," she told UTV.
"Together we all have a role to play and I think we need to be very effective on the ground."
"I think it has raised the consciousness of people, raised a lot of awareness in terms of animal welfare issues. It was a totally deplorable act, what happened to Cody."
The attack against Cody is not an isolated incident,- earlier this month young boys were found trying to burn a kitten alive in the Brandywell area of Londonderry.
More kittens were found, and they are being cared for at Rainbow Rehoming Centre, where Joanne McMullan said harming animals can be a warning sign.
"Anyone that starts out abusing animals as a young child, nine times out of 10 they go on to more serious crimes later on in life, whether it's more serious crimes with animals or moving on to people," she explained.
© UTV News