Wet weather throughout NSW has created strong breeding conditions for the predators, with mobs of up to 60 pigs being spotted in single nights.
NSW Farmers Wild Dog Co-ordinator Bruce Duncan said as surface water dried up, the pests have headed for permanent water sources like farm dams, with numbers particularly high in the far west of the state.
"I've regularly seen mobs of 20 or 30 pigs ... you're getting mobs of little pigs ... and we've seen multiple litters from the same pig," he told AAP.
"They can quickly rip through fields and fences, attack lambs and goat kids, and can bring disease as well."
Vision captured in Western NSW as part of a wild pig and dog monitoring program showed dozens of wild pigs roaming free. Some adults weigh 100 kg and more.
"There are big pigs out there," Mr Duncan told AAP.
"Pigs can come in and do alot of damage ... especially in some of the grazing country, they can dig alot of it up and nothing grows in that country until it gets another flood through it," he said.
Mr Duncan said there is also increased wild dog activity, although dogs tend to be more elusive.
He said last week a worker in far western NSW spotted two wild dogs rounding up sheep, before later finding dead animals in the area.
There are more than 23 million feral pigs in Australia, costing agriculture more than $100 million per year.
Wild dogs also take their toll on the sector, costing agencies an estimated $50 million in management costs before livestock deaths are even accounted for.
Queensland canegrowers have also told AAP "it's a particularly bad year for pig numbers."
NSW Farmers President James Jackson said staying vigilant and working through co-ordinated pest management was vital.
"Farmers are regularly trapping more than 60 pigs in a single week, it's just a huge problem at the moment," he said.
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