Actually, I suspect the worst breed with kids, based-on its natural temperament, would be a Corgi.
Gut instinct says that probably a big no-no with a group of other people's kids would be an attack/guarddog of the Doberman, Rottweiler, GSD, etc type, although I know these can be very good family pets if their owners train/socialise them properly, unlike so many which are trained/encouraged by their chav owners to be viscious - like that PitBull in that case last Christmas
I thought I'd have a Google, but I've not managed to find something on breed statistics for dog bites/attacks, although here's a document I found relating to human fatalities by dog attack in the US 1979-98
http://www.cdc.gov/ncipc/duip/dogbreeds.pdf
- I guess it's detailing fatalities, rather than attacks/bites, so bigger more powerful dogs will figure higher than little snappy things
- but top of the list are Pit Bull (118), Rottweiler (67), GSD (41), Husky-type (21), Chow Chow (21), Malamute (16), wolf-dog hybrid (15), Doberman (13), Great Dane (13), Sled dog (12), St Bernard (8), Labrador (8)
- note though that the report author states that this isn't balanced based on relative numbers of the dog breed : the Lab is by far the most popular dog in the US and there are huge numbers of them, conversely there won't be very many Huskies/Malamutes/Sled Dogs
- but these will be kept as working dogs rather than pets
The author does note that pit bulls & rottweilers between them accounted for 67% of deaths in this 20-year period, but states that this might be factored by owner-related issues : "
less responsible owners or owners who want to foster aggression in their dogs may be drawn differentially to certain breeds"
(I suppose I'm really sick but I'm amused that the report author isn't counting one death where the victim died "
from fire ant bites after being pushed on a mound by a dog" )