Science Alert:  We Now Know When Dog Brains Shrank – And It Might Be Our Fault

Dogs have far smaller brains than their wolf relatives, and now a study led by researchers in France has plotted a timeline for when this shrinking – sometimes considered a mark of domestication – might’ve begun.

Sparky says that his brain shrank when he met Chumley. 

Scientists say that dog brains shrank during the Neolithic period, at least 5000 years ago when humans started farming and domesticating animals.