According to some animal shelters, they stop the adoption of black cats during the Halloween season, as they may be used for ritual sacrifices, as reported by Vice. A shelter based in Los Angeles was asked about it, and they said, "We're afraid they're going to harm them." These shelters are wary of people who only adopt the cats to use for nefarious purposes. Another shelter from Newport Beach gave the Daily Pilot a different reason. In their case, they fear that black cats will only be used as decorations or props during Halloween and will be dumped when the season is over.
According to Smithsonian Magazine, there is no concrete proof that people go through a sometimes-lengthy adoption process just to sacrifice a black cat during Halloween. However, some animal shelters want to err on the side of caution and would rather not risk it. Interestingly, October is International Black Cat Awareness Month, and it is celebrated by dispelling the superstitions about black cats. National Black Cat Day is also celebrated on October 27 every year in the United States (via National Today).
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