The move will help overcome problems experienced by council rangers who are notified of an attack but can't prove the offence.

The move will exonerate dogs who have been falsely accused.

Rangers will be able to compare DNA from a victim's wounds with that obtained from the dog named as the offender.

A council spokeswoman said the council had acquired a DNA kit and staff would attend their first training course in January. Once staff were trained, the kit would be utilised.

The kit contains DNA collection swabs, gloves and tamper-proof evidence bags.

Rangers will take a swab from the dog's mouth, or some hairs, and send the samples to a laboratory for testing.

Sutherland will become the second Sydney council to introduce the technology, with Botany Bay Council leading the way this month.

Local Government Minister Paul Lynch supported the new technology, saying the community expected protection against dangerous dogs.

The technology would support laws to combat dangerous dogs, which were strengthened last year after a series of dog attacks, including the fatal mauling of a four-year-old girl at Warren, in the state's north-west.

``NSW has the toughest dog laws in Australia, giving councils greater powers to keep dangerous dogs off the streets,'' Mr Lynch said.

``Maximum penalties of $55,000 and/or two years' jail are a significant deterrent to irresponsible dog owners. Most dog owners do the right thing by the community but we need tough dog laws to protect families from aggressive dogs.''

Mr Lynch said the Government was also educating children through the Safe Pets Out There program, whereby volunteers will go into schools during the next three years and teach children up to year2 how to act safely around dogs.