The RSPCA will head to bushland north of Newcastle today after bushwalkers said they discovered what is feared to be a greyhound burial site.

Bobbie Antonic said her friend, Tracey, raised the alarm on Saturday, saying she found two skulls that looked like they came from dogs in bushland in the Swan Bay area.

Ms Antonic said she checked the site out for herself and said she found at least seven skulls.

"We went down and had a look ... we found lots of bones, lots of skeletal remains," she said.

"We saw skulls with blunt trauma on top of their head and the more we walked we found more skulls with blunt trauma.

"It's pretty sad. Swan Bay is a pretty quiet area and to know that someone has dumped clearly greyhounds ... and there's a hessian bag and there's a tarpaulin as well and so there are more bits and pieces in that as well."

Bobbie Antonic said she found at least seven skulls. ( Supplied: Bobbie Antonic )

The RSPCA has confirmed it will go to the site today to make a proper assessment and if there are remains, establish a cause of death.

The NSW Government last month announced greyhound racing would be banned in the state from July 1 next year.

The ban came after a special commission of inquiry found overwhelming evidence of animal cruelty, including mass greyhound killings and live baiting.

The remains of greyhounds were discovered at another site in the region last month.