The most bites that vets in this country get are from....Goldens! ( The most popular breed? Goldens!)
American bloodline GSD's just don't have the prey drive that their European couterparts have but still they are very unlikely to bite without reason - protective aggression is the biggie.
Angels3 - Tibetan Spaniels don't tend to bite as they were bred for temperament, to fit in with the monks, rather than taking on the philosophy of the monks.
King Charles Spaniels are a pretty new breed as breeds go, especially in the US. They, again, were bred for temperament as a lap dog.
Any small dog that is carried and, understandably,worried over....who is going to step on it, kick it, not see it on the floor.... is going to have to protect itself and is also going to have a higher opinion of itself than a big dog( every time the dog feels worried it is picked up - many are "trained" to feel worried because of the owners reaction to a "threat") that is left on the floor to look after itself. A Great Dane is not going to have the same reaction (..if any!!!) to big human feet or hands coming towards it as a toy dog.
Border collies have the reputation as a nippy breed because dogs that come from working stock - old working stock - have to nip sometimes!
The same with some of the gaurding stock - if you approach in a way that triggers the protective traits, that humans have encouraged, you will be bitten.

In any study you have to look at the number of breeds, the number of each individual in any breed and the circumstances of the bite.


As for how stupid is a sight hound?
As pets they tend to have devoted owners who love them and strive daily to get a similar reaction from their dog. The dog meanwhile has the comfiest places in the house to sleep, the best grub, the majority of the owners attention while the owner is at home, admiring comments and attention from strangers when out for a walk and a total veto to any training past house training.
(USUALLY!!!!!!!!! )
They can do what they like when they like and if they train their owners properly they can usually get some company, if they want it, when they are doing it!
Yeah - pretty dumb.....I don't think!