'Surprisingly, most owners reported that they did not intentionally teach their dogs toy names, but rather that the dogs just seemed to spontaneously pick up the toy names during unstructured play sessions,' said Shany Dror, lead researcher.

Source: https://www.dailymail.co.uk/galleries/article-12864337/Is-dog-gifted-Scientists-reveal-3-key-signs-look-for.html?ns_mchannel=rss&ns_campaign=1490&ito=1490