Scientists take a peek behind those sad puppy dog eyes

Today, pooches use the muscle to raise their eyebrows and make the babylike expression. That muscle is virtually absent in their ancestors, the wolves.

from NBC News Top Stories https://www.nbcnews.com/news/us-news/scientists-take-peek-behind-those-sad-puppy-dog-eyes-n1018451?cid=public-rss_20190618