Understanding the evolutionary history of domestic dogs from wolves provides context for why certain welfare-compromising human behaviors toward dogs are so damaging to their wellbeing.
Understanding dogs' evolutionary origins clarifies why certain welfare failures are particularly damaging. Dogs evolved to live in close social association with humans — isolation is deeply abnormal for them. The human-dog bond relies on communication through mutual gaze and vocalization — isolation in kennels or neglect ruptures this bond causing profound distress. Dogs bred for extreme conformations (flat faces, giant size, dwarfism) have been artificially pushed far from the functional anatomy of their wolf ancestors, causing the health problems endemic to these breeds. The evolutionary context makes clear that dogs need social connection, appropriate exercise, and bodies that allow comfortable movement.