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MAYNARD, Mass. (AP) — A photographer who says black dogs are often overlooked is gaining international attention for his striking canine portraits.

Pet photographer Fred Levy first heard about “Black Dog Syndrome” in a 2013 conversation at a dog park. It’s a disputed theory that black dogs are the last to get adopted at shelters, perhaps because of superstition or a perception that they’re aggressive. The idea inspired 45-year-old Levy to take up a photo project on their behalf.

His portraits of black dogs against black backgrounds went viral online and will be published in a book this September. He is calling it the “Black Dogs Project.”

Levy’s first canine subjects came from dog owners he recruited online. Recently he started photographing abandoned dogs from shelters. By posting their photos and stories online, he’s already helped several find new homes.

CLICK HERE to read more or HERE to view the project’s website.