Why are their so many species of dogs?We're primates that developed from a common ancestor 5-7 million years ago that yes was an ape.
That is a fact....The evidence is very strong.
Not a fact, it is a theory, big difference. And if we descended from an ape, why are there still apes?
Dogs are a funny anomaly. They were reclassified fairly recently (by some) as Canis lupus familiaris which should hint at the difficulty in explaining them. Domestication does strange things.
Of course the poster asked why there are so many species of dogs- and I think he was speaking of the many breeds rather than the few other species of wild dogs.
Domestication does indeed do strange things- have you read about the experiments with breeding domesticated foxes? If you haven't you should read about them.