i would say definitely shepard mixed maybe with a greyhound...she might have some border collie in her due to the coloring (white chest, white socks) but i really dont see much of anything else that resembles a border collie physically. but then again, maybe one of her parents was a border collie mix.
BC's are stockier, shorter legs. and have a shorter snout.
my gf's dog is a heinz 57 too. they advertised her at the pound as a pitbull mix...we have no idea what with. she has huge ears like your Sadie that stand straight up. and her nose is long and she's taller than most any pit. but she has the muscular body of a pit and the strong jaws of a pit!
it's interesting how the offspring can look nothing like the parents especially in the case of mutts/strays. my stray cat had kittens last year. she's a grey tabby...she had 5 kittens: 3 orange tabbys, 1 tuxedo (black and white) and 1 grey tabby! we kept one of the orange tabbies, her name is Cheese. and no one believes us that the grey tabby is her mom. we already had one adult orange tabby, Macaroni. and everyone automatically assumes that Mac is Cheese's mom.
