What Breed is My Dog?

I have a rescued dog. She's fairly large, but is lean with medium length fur on her back, neck, and rear. She is light brown with a white belly, one upright and one flopped ear. The vet said that the flopped ear is due to lack nutrients when she was a pup so it didn't stand up. She also has a curled long tail that hangs down when normal.

By Ryuuko O.