This is a picture of my two dogs and I at the Balltown overlook on a recent Sunday afternoon. The dog with the white head who is yawning is Bub, and the dog with the brown head that is panting is Moose. You can find another picture of Bub here where he helped illustrate a blog post about Iowa work comp cases involving intoxication.
I think it would be very hard to get Bub to bite you. Moose is also a very nice dog. However, she got the name Moose because she became the leader of all of her litter mates, and she was actually one of the smaller dogs in the litter. (Moose and Bub are siblings, and Bub has been taking orders from Moose for every day of his 8 ½ years on this Earth). Moose is also fairly territorial. I think there is a small chance that Moose would bite a person if she felt she was in danger.
There are plenty of dogs like Moose that will bite a person if circumstances come together in the wrong way. Additionally, if some dogs are around small children with food, the dogs will bite the children as part of trying to get the food away from the children. Unfortunately, in these situations children frequently get bitten in the face. I never leave my dogs unattended for even a moment around small children with food.