The reason for the prohibition on black dogs is because the terrorist prophet Mohammed ordered almost all dogs to be slaughtered (Work dogs were permitted to remain alive). He especially forbid any black dogs to remain alive or to be in the service of Muslims as work dogs such as those needed to hunt or herd livestock.
Liberals fought pretty hard for the passage of the Americans with Disabilities Act. Well... according to the ADA it is illegal to keep a disabled person out of school or discriminate on the basis of their need for a service dog.
Somali Muslim cabdrivers in MN were refusing to pick up disabled people with dogs. I don't know how that eventually turned out, but I do remember many liberals, even the detestable Minneapolis Star Tribune kind of taking the asinine "multicultural" approach as if Islam gave them a right to violate U.S. law.
It seems the insanity of "multiculturalism" means even the law takes a back seat to insanity.