Is dog scared of black color?

Dogs do not perceive colors the same way that humans do because they have fewer of the receptor cells responsible for processing colors in the retina called “cones," but their color distinction, though less refined than ours, remains remarkably sharp nonetheless.

So, dogs aren't really afraid of the color black; they may be startled if a black-furred creature, which they have difficulty recognizing if it is in darkness, moves unexpectedly.