I'd also say greyhound is in there. That head and eyeshape, screams sighthound. Shepherd? Maybe. Collie? I doubt it.
Collie + Greyhound would keep a pricked type ear since both carry the recessives for a folded ear, although diffrent types. The heavyness of this dogs ear leather would make one look at another breed who possesses a heavier leather.
However look at the tight tuck in the middle and the small size, pressed closed to the head. That initself helps speak of the possible greyhound origions.
I wouldn't say suluki becuase they have a heavy, hound ear which dominates the genetics as well.