Ayla (a) struggles with her identity as a Cro-Magnon blonde living amongst brunette uni-browed Neanderthals, (b) has a mixed-species child, (c) learns to ride horses, (d) has hot prehistoric "relations" with a studly guy named Jondular, and (e) goes on some Mammoth hunts with others who speak suspiciously like 20th century, college-educated engineering students.
Beyond the (enjoyable) ridiculousness of the whole thing, however, we also watch Ayla adopt a young wolf puppy (cleverly named "Wolf"). We are told, in some hilariously overwrought prose, that similar adoptions eventually led to the domesticated dog. In other words, Fido.
Generally, most folks agree that the dog (as we know and love him) is a subspecies of the Gray Wolf. In other words, a single species of wolf is responsible for nearly every dog on the planet today. The domestication of our favorite fur balls took place at least 15,000 years ago, though without Mr. Peabody's way-back machine we can never be sure.
Interestingly, "toothy canine" skeletons in Belgium have been clocked back to 30,000 years ago, so perhaps Ayla was active in dog adoption circles after all. More interestingly, some recent research seems to indicate that all dogs may come from a single group of wolves domesticated in China.