I'm Ojibway / Cree from northern Ontario and in our language we distinguish foxes according to colour
Mahkehshoo ... the word for 'red' - mookoowak - is derived from the word for blood 'mookoo' ... and adding the 'shoo' at the end notes that it is in reference to an individual or being ... so you get 'Mahkehshoo' - 'the red one'
Mahkahtehshoo .... the word for black or darkness is 'mah-kah-teh-oo' and again, adding the 'shoo' at the end is in reference to it being applied to a individual or being ... so you get 'Mahkahtehshoo' - 'the black one'
Wahpahkehshoo ... the word for white is 'wahpack' and like the others, adding 'shoo' means you are talking about an individual or being ... so you get 'wahpahkehshoo' - 'the white one'