Genetic analyses show that all varieties of domestic dogs are descendants of the wolf, and studies show that wolves have brains nearly twice the size of those of dogs of comparable size and that wolves are correspondingly more intelligent
But given that there are about 38 thousand wolves in North America, while there are over 50 million domestic dogs, it is obvious that dogs have been amply compensated, from an evolutionary standpoint, for the losses produced by their association with humanity
Evolutionary success of a species should be measured by the number of individuals in that species rather than by the abilities of those individuals.