Did you know that when a dog yawns, it doesn't always mean she/he is tired or sleepy? In dog language, a yawn is often a pacifying gesture.
The dog might be trying to say - "no need to be afraid of me. I mean you no harm."
Please note that any information that I post here about fuzzy companions is not meant to take the place of the advice of a trained and certified behavorist, trainer or vet. The information I share is based on my experience, training clases I have taken, and books and articles I have read. My pratical experience is based on living with and rescuing dogs (and one cat) since 1990 and volunteering and working at various shelters since the mid 1990s.