Riley Martin disappeared from his home at Nambucca Heads at midday (AEST) on Wednesday and has not been seen since.
The boy, from Short Street, is described as being of Caucasian appearance with short brown hair and was wearing red pyjamas and a black top.
Three family dogs, two fox terriers and a kelpie, have also disappeared.
Emergency services, volunteers and neighbours have been scouring the area around Riley’s home.
NSW Police said their search for Riley was suspended on Wednesday night due to failing light, but local police were continuing to search overnight.
A briefing is due to take place at 5.30am on Thursday before a major search resumes half an hour later.
Local police, water police, the dog unit, the police airwing, PolAir and police on trail bikes will join the search, helped by volunteers from the State Emergency Service, Volunteer Rescue Association, Surf Life Saving Association and the Rural Fire Service, as well as local residents.
Anyone with information on Riley’s whereabouts is urged to call triple zero.