Dingos, Wolves and Coyotes are distinct species; their differences and disparities are more than just behavioral, behavior and genetic drift that arose from having to evolve to meet the demands of their enviornment.
This is not quite correct; coyotes (
Canis latrans) are a closely related separate species from wolves, but dingoes (
Canis familiaris dingo) are debated among taxonomists as either a subspecies of domestic dogs or a feral throwback population that
doesn't even reach the level of a subspecies.
The line between a species and a subspecies rests on interbreeding; a subspecies is a distinct population that doesn't crossbreed in the wild due to isolation but *is* fully reproductive with other subspecies. whereas a full-fledged species is defined by being reproductively incompatible. Very closely related species sometimes have a limited ability to crossbreed, but in such cases the offspring are either sterile or nearly so.
With humans, you *might* be able to argue that races would count as subspecies, except that human racial groups exhibit classic clinal variation with substantial gene flow between groups, i.e., while there are clear patterns of inherited characteristics within racial groups, the actual genetic variation is very limited and there are no clear dividing lines distinguishing between those groups.