Exactly what you think will happen.
Especially when a 45kg dog jumps excitedly hitting its head onto your lower jaw.
By the way, for those that think Fifi and Whiskey are the two Rotties-in-disguise in the previous post, this message is for you.
You are a Moron.
Please Google any terms you aren't familiar with before leaving a comment here. However, your comment is so funny I have decided to leave it in.
Update: Pa just spotted Bruno's snout having a little abrasion. It should be more painful than it looks!