A dog and two cats are unaccounted for after a massive house fire in Markham on Thursday night, Markham Fire Platoon Chief Dave Reid told CityNews.

The fire broke out at 19 Wincanton Road near Brimley Road and 14th Avenue.

Crews arrived around 6:15 p.m. to find the home fully engulfed and took a defensive position before containing the blaze.

“We are not treating the fire as suspicious,” Reid said.

No one was hurt, and the search for the missing animals is ongoing.

Reid wouldn’t comment on a cause, but said an investigation will continue on Friday involving the Fire Marshall and York Region Police.

Damage is extensive, he said.

“The entire roof was ablaze,” one witness said. “I have never seen a fire that big before.”