This is an Irish-marked melanistic coyote.
The melanism trait originated in domestic dogs and was transmitted to wolves and coyotes through crossbreeding.
The same goes with Irish markings.
I posted a photo of a normal gray coyote with Irish markings last year.
This is the first black one I’ve heard of.
Coyotes with dog colorations are not unheard of.
Dogs and coyotes can produce fertile offspring when they cross, and coyotes now live in a world where there are lots of dogs.
Now, coyotes apparently have very strict monogamy, even in urban settings.
And this is probably what keeps coyotes from becoming totally inundated with dog genes.
But there is enough of a gene flow between dogs and coyotes to introduce these novel colorations.
It’s possible that some of these colors are popping up as novel mutations in coyotes, but they seem to be found only in populations that are known to hybridize with domestic dogs or wolves. In populations where the coyotes are generally pure, their color doesn’t vary that much at all.
So it seems more likely that dog genes are the reason for all these strange coyotes.