I tried this.

As I clicked on the home page of my browser, this story came up
http://uk.news.yahoo.com/itn/20080806/tuk-yawning-dogs-are-copy-cats-dba1618.html
I wasn't sure about this story. So, like an idiot, I sat here yawning at my Westie. He looked at me as if to say..."go away, mad woman" then turned his back on me. I have also seen my friend yawn in front of their collie, and he does yawn.
What the article hasn't considered is the "intelligence" of the dogs concerned. The smarter dogs aren't fooled as easily. After all, you can sit there, looking at another person, and keep yawning, and before long they start to yawn back. (I have tried this as well, and the degree of alertness seems to be a factor.)