Grey Jeyne: A bit of a glutton. Kills one of Harwood Stouts dogs over a bone.
Alison: Very playful. Loves to annoy Ramsay’s horse Blood.
Maude: The leader of the pack.
Kyra: Ramsay’s newest bitch. Has taken a big liking to Theon
Willow: A gentle dog, but also the weakest.
Helicent: A ferocious beast you don’t want to mess with.
Sara: Very dutiful and good at hunting.
Red Jeyne: Ramsays favorite, if he had to chose one.
Jez: The worst trained one - and the loudest.
They're not a specific kind of breed. I mostly looked at medieval drawings of dogs and made them a bit more bulky and aggressive looking, though Helicent's coloring is obviously very Rottweiler inspired.
You think all the bastard's girls can kill Summer and Shaggy if in the second book Ramsay find the children?
It's close enough to what he did with Theon, actually.