A 2013 behavioral study found that dogs can show when they're happy to see their owners by lifting their eyebrows. Their left eyebrow went up when they saw their respective owners, the study found.

Distributed under a CC BY 2.0 license. In the new study, Huber and his colleagues trained pet dogs to discriminate between images of the same person making either a happy or an angry face.

Happy dogs often have bright eyes, a good appetite, and healthy sleep patterns," she said. "Every dog is different, but generally, if they're engaged, energetic, and responsive, that's a great sign." ...

Dogs may indeed be able to discriminate between happy and angry human faces, according to a new study. Researchers trained a group of 11 dogs to distinguish between images of the same person ...

Researchers trained a group of 11 dogs to distinguish between images of the same person making either a happy or an angry face. During the training stage, each dog was shown only the upper half or ...