The guy in the picture is the only one that seems to notice that the dog is going crazy back there. The girls are just worried about looking cute in their selfie. The apartment could be on fire, casting a beautiful amber glow, and a girl would want to stay to get the perfect selfie in the fire-light. "Just a few more pics. This lighting is perfect." / "Your skin is literally peeling off, Jennifer. We gotta go." When you have the perfect lighting, what can you do? You just have to go for it.
This dog is either fighting off some kind of invisible creature, or the dog is turning into a creature. I can't tell with just one frame. That's why I wish this was a video. You'd fast forward thirty seconds and the entire pool water would be red. "What... happened?"