Dogs recognize smiling faces 00:33. Potty training dogs has a lot to do with raising your voice and pointing fingers. But maybe a smile or a frown is the way to go.

So, for this study, 11 dogs (mostly border collies, plus a sheltie and a fox terrier) stood in front of a little kiosk with a computer screen showing them two images of the same person making an ...

Then, to test the dogs, researchers showed them different images than the ones used in training, using either a different half of a face the dogs already saw or an altogether new person’s top or ...