Beware of mothers defending their babies

WARNING: This video starts cute but doesn't end cute. It shows a dog being hurt by a mother deer.

To me the dog in the video looks old. It doesn't seem to be able to move quickly to defend itself at all. Someone said they thought the dog was trying to show submissive body posture to the deer but I don't think so because it keeps trying to get up to get away. It is to bad that A) the dog didn't go faster to the owner when called and B) the dog wasn't on leash with a wild baby deer in the area. I also don't know why the owner didn't try to scare the deer away instead of just yelling. (But maybe there was a mobility issue on their part.) And why didn't the person videoing put DOWN the camera to help either? The cat gets lucky by being faster than the dog. (and you'll notice that a person DID stick up for the cat) I posted this in hopes it may help any future dog owners if they find themselves in a similar situation.