Fire is probably why the human's brain grew bigger and his gut became shorter and his jaw weaker.
Hmm I always thought it was brought about by the consumption of certain types of mushrooms.... IE eat a shroom see your god!....
Could be wrong though....
As for dogs,well the school is still out, certain people claim there are 2 distinct "types" of dog and both types have been selectively bred for purpose and for looks. The large Mollosor breeds are said to be from a different descendant than all other breeds/types. These Mollosors are large dogs,the ancient wardogs,not the roman type but before that were up to 42 inches at the whithers and weighed well over 200lbs. The Mollosian Hounds were said to take a man and horse down!
These types are certainly much different from spitz,terriers and most herding breeds. DNA testing is inconclusive as there are almost no true Mollosors breeds today,most have had influx of other types. I doubt we will ever know the real answer!