I've never seen one in Oregon,Co0lorado, Nevada, CAlifornia, Arizona and that includes years of predator hunting and looking at thousands of coyotes. I have seen from almost white , silver, grey and red to dark grey.
I suspect you have wolf croses and if a dna test were taken that would probably show this to be the case. If the female is a coyote the pups are usually small too. I would imagine a female coyote in heat would be an apt mate for a young wolf looking to start a family.
God bless, Steve