contagious yawning

Dogs certainly yawn when they are sleepy, but researchers also observe yawning during stressful, emotionally arousing and social situations. The surrounding context often matters more than the yawn itself. A dog stretching out on the couch and letting out a huge yawn probably looks ready for a nap. But dogs also yawn while standing in a veterinary clinic, during training, around unfamiliar situat.. ดูเพิ่ม