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http://www.blackdogrescueproject.com/black-dog-syndrome.html
Black Dogs are the Last to Find Homes
Many people that are not involved in dog rescue have a hard time believing that black dogs are so much harder to place than dogs of other colors. Some people think that Black Dog Syndrome doesn't exist at all. Others think that the only reason there are more black dogs in shelters than dogs of other colors is because black is the genetically dominant color for many breeds and Labrador Retrievers are the most popular dog in the U.S. at the moment.
There are no hard facts to help explain Black Dog Syndrome, but their are many theories on why black dogs are the last ones to be adopted.
Photographs
Hollywood
Human Nature
Shelters
Language
Superstition