LOL, puppies for you! I think she was just confused and trying to figure out what she was seeing.
Reminds me the first time Gryffon saw people on horseback. He had seen horses of course, running loose in a field, or in a paddock. As part of his socialization when he was around 9 or 10 months old (?) we went to an indoor arena and sat down in the bleachers near the rail to watch. There were several people riding around schooling their horses. Gryffon sat up straight his eyes wide open staring, staring, staring, not moving a muscle, just frozen in place. I could tell that his brain was going a mile a minute trying to figure out what these strange horse/human hybrids were. It was pretty amusing, actually.
Then one of the riders came rode over asking some questions about Gryff - with the horse and rider close by, me talking to the person, the horse snorting and stretching his neck, it finally clicked for Gryff! As soon as he figured it out, he lost interest, relaxed and laid down - it was like the light came on - OH! it's a horse AND a person on sitting on the horse! Boooooring . . . .