Dogs’ Brains Started Shrinking 5,000 Years Ago, Study Finds

Dogs have smaller brains than wolves, but until now scientists did not know when the shrinking began. A new study reveals the change started at least 5,000 years ago. Researchers say the findings offer fresh insights into the domestication of dogs. However, they stress that a smaller brain does not mean dogs are less intelligent than their wolf ancestors. The study does not explain common dog behaviors, such as drinking from muddy puddles. Brain size reduction is not linked to a loss of smarts, experts note.