There's no doubt in my mind. First, look at the profile on the horse's face in the background and the grey one in the foreground. You can clearly see the jibbah on the forehead that creates the characteristically dished look in most Arabians. There's little to no chance that the chestnut in the back ISN'T an Arabian horse. They've cut the bridle path wide to accentuate the arch of the neck as well as used Arabian style show halters. There wouldn't be much point in showing the average horse (non-Arabian) in an Arab-styled halter due to the size/fit differences and the fact that breed halters are made to accommodate a certain head style. Then there's the matter of the large nostrils and short canons, but that's a matter of opinion and camera angle. =] Definitely Arabians.