الطبيب البيطري الدكتور دو باي: العالم بعيون أصدقائنا الحيوانات، الجزء 1 من 2‏

Not only do canine and feline companions provide psychological support to humans, but we also are very gifted in assisting with your physical conditions. But why are dogs and cats able to relieve your stress? It is because they can smell it with their nose. When you are very sad, and when you pour your heart out and talk to them, they can smell the changes in your hormones. So, in fact, they often comfort you. “It’s ok; it’s all right.” After all your sorrows are washed away, you will feel better.