paedomorphism

This rapid evolution of dogs from wolves is an example of neoteny or paedomorphism.

Both processes result in paedomorphism.

Paedomorphism or paedomorphosis is the retention by adults of traits previously seen only in juveniles, and is a subject studied in the field of developmental biology.

Gun dog breeds used in hunting-that is, pointers, setters, spaniels, and retrievers-have an intermediate degree of paedomorphism; they are at the point where they share in the pack's hunting behavior, but are still in a junior role, not participating in the actual attack.