Usually in the Furry Community a fox is more of a prey species to all of the bigger guys, I know in nature and the Zootopia Universe Foxes are considered predators, so it works with the image.

Art & ilbv © ilbv
Art Trade with DrakeHillside and his Fox Character.

Also my favorite Fox/Human vore picture of all time was drawn by skaifox and it's a glorious piece to behold http://www.furaffinity.net/view/3954810/