Grey side-gilled sea slugs found in Pilot Bay are the same species as those attributed to the 2009 dog deaths.
"It's a new risk," said Dr Jim Miller, medical health officer at Toi Te Ora - Public Health Service. "It's another thing for people to look out for."
While the sea slugs have been seen in the water, there have been no reports of their presence on land.
Rob Donald, of the Bay of Plenty Regional Council, said the sea slugs become a risk when they start to wash up on beaches. MORE>>