The have already been many sightings of the venomous red-bellied black snake this spring.
And although each year in NSW there are about 300 snake bite cases, they are rare among children; with only 16 emergency cases at The Children's Hospital at Westmead in the last five years.
"The last snakebite-related injury we saw at The Children's Hospital at Westmead was in early March," said Mary McCaskill, medical director of the emergency department.
"But now the weather is warming up and bushfire season is upon us, the risk of a child being bitten is slightly higher."
Blacktown veterinarian and councillor Russell Dickens said he'd seen dogs "just die from snake bites in the past few weeks".
Richard Naylor, the principal at Castle Hill Veterinary Hospital, said the red-bellied snake's toxins were more concentrated at this time of the season.
"This is the time of the year. Snakes are out either shedding their skins or not shedding — and they're on the warpath," he said. Also commonly found in western Sydney are brown and tiger snakes, which have potentially lethal venom.
In fact, in January 2007, a 16-year-old Whalan boy died after he was bitten on the hand by an eastern brown snake.
In NSW there are about 300 snakebite cases each year.
Last financial year, 14 people were admitted to Blacktown, Nepean and Westmead hospitals with snakebites.
Dr McCaskill reminded parents to supervise children when they were outside and if there was a snake, to simply leave it alone.
"If a child is bitten, first aid should be applied immediately," Dr McCaskill said. "This includes placing a firm bandage on the bite site and keeping the limb as still as possible until the ambulance arrives. The area should not be washed as the venom on the skin may be used to identify the snake."
Dr Naylor said it was important to jot down the colour, length and location of the snake if possible. "If you see a snake take a wide berth," he said.