York Regional Police and local farmers in Aurora are on the lookout for horse thieves after three horses went missing from two separate farms.

About 30 volunteers slogged through the rain on Sunday looking for a grey Arabian horse that went missing from its owner's field more than a week ago.

The horse, named King, disappeared from Deanna Ramsay's property near Bloomington Road and Leslie Street.

"No trace, no footprints, no nothing. It's like aliens picked him up and carried him away," Ramsay told CTV Toronto.

Ramsay is sure her horse was stolen because a trail in the grass stops at a nearby driveway of an abandoned farm.

Last weekend, two thoroughbreds were taken from a horse farm at Jane Street and Highway 9.

"With the other stolen horses too it just becomes so unlikely that he is still wandering around," Ramsay said.

Ramsay said she will expand her search for King to the Internet and horse auctions.

With a report from CTV Toronto's Austin Delaney