Bastard's girls

All of Ramsay’s hunting dogs. I made up some personalities for them based on what I associate with their name and of what we know from the books.  From top left to bottom right:

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.