Are coyotes, wolves, and domestic dogs separate species? Why or why not?

Although coyotes (Canis latrans), wolves (Canis lupus), and domestic dogs (Canis lupus familiaris) are capable of interbreeding and producing viable offspring, the article suggests that any instances of them interbreeding are brought on more by necessity for the survival of the species than by a preference for individuals of another species. For example, the article mentions that the latest hybridization event between dogs and coyotes is likely a result of female coyotes traveling into upstate New York, where a lack of coyotes was more than made up for by an abundance of feral dogs, and yet now that the coyote populations are thriving and growing, coyotes have no shortage of coyotes to mate with and so show no interest in mating with dogs. The same thing occurred a century ago when wolf populations were at a dangerous low in the Great Lakes, so they had to settle with mating with coyotes. Under normal circumstances they would not choose to breed between species, which suggests that coyotes, wolves, and domestic dogs are three separate species.