From the BBC (among others):
Yawning is known to be contagious in humans but now scientists have shown that pet dogs can catch a yawn, too.
Science News has it too:
Dogs watching a person yawn repeatedly will yawn themselves, says Atsushi Senju of Birkbeck, University ofLondon. Just as that big jaw-stretch spreads contagiously from person to person, it spreads from person to dog, he and his colleagues report in an upcoming Biology Letters.
There’s a short video (click the photo).