The City of Vancouver has decided not press charges under its animal control by-law, after a 72-year-old man pulled a folding knife and stabbed and killed a pit bull that was biting down on his pet pug's neck last November, at Kitsilano Beach Park.

In a letter posted by the dog's owner on Facebook about the attack on Pandora , city prosecutor Ellen Gerber says the evidence doesn't support a charge under the city's animal control by-law.

The attack happened Nov 20 around 1 p.m. PT when the pug's owner walked by a woman, who was with her pit bull in Kitsilano Beach park.

The owner of Pandora, a pit bull stabbed to death by an elderly man after it attacked his pet pug, has received a letter from the city saying no charges would be laid under the city's animal control by-law.

When the dogs approached each other, the larger pit bull suddenly bit down on the neck of the smaller dog.

Unable to separate the animals, the 72-year-old owner of the pug pulled out a folding knife he was carrying and stabbed the pit bull, killing it.

The pug was rushed to a veterinary hospital for stitches to its neck. Animal control officers also attended the scene.

Gerber says, even though the pug was being walked off leash, charges aren't appropriate.

"In light of the impact of Pandora's death on all persons involved, I am satisfied that further infractions are unlikely," she writes, "and that any conviction would result in a very small or insignificant penalty."

In a Facebook post, the pit bull's unsatisfied owner asks supporters to write letters to the city and says she is still hoping Crown counsel will consider criminal charges of animal cruelty.

However, at the time of the incident, Vancouver police said it didn't believe there was any basis for criminal charges.