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Hard to say ... and depends on what else their ancestors may have once been able to interbreed with. I don't know whether a modern fennec fox can interbreed with other sorts of canines, but it's probably not a true fox. I recall seeing some show that indicated they have less chromosomes than foxes.
... anyway, most domestic dogs originally descended from the jackal, whereas the German Shepherd Dog and various sled dog breeds have more wolf ancestry, and they're all "dogs" today.
So ... who knows? They might figure it out when scientists have finally gotten around to mapping every creature's every chromosome.
Interesting speculation.
