I hope he’s only biting liberals.
Bush should get two gigantic mastiffs for Obama’s next visit (/joke just kidding!)
These must be non-dog people.
You always offer your hand below the dog’s chin, preferably squatting down if it is a smaller dog, like Barney, so he/she can smell it first. Then, if dog seems content with the sniff-over, you pat the side of the neck.
Towering figures bringing hands down over a dog’s head, to pat the head, are just asking for a good bite. If you were a dog, what would you think?