It looks to me like the dog is running in fast. The bounciness of the run looks to me to be the result of a low frame rate in the video more than anything else.
If that dog was being aggressive, it would have lowered it’s profile and set for a lunge... it didn’t, not even close.
I have to disagree with that. If a dog is going to run in and then jump up to lick someone it usually jumps up towards the face. If it is going to tear into someone it usually goes after a leg or the hands. The dog would lower it's profile more in a overly friendly approach than in an aggressive one because it has to shift it's weight down before jumping up. To attack down low, it just lowers mostly it's head at the last minute. To go after hands or leg it might jump but not as high, so it doesn't have to shift down low as much first.
I like dogs. I used to help out at agility competitions. However, I've also been bit a few times as well, and never above the waist. I did however have a friend who's standard poodle would launch itself from nearly ten feet away and try and lick my nose while just just bouncing off my side with it's shoulder as it flew by.
I own and train German Shepherds. That dog was not being aggressive, the cop however was. He needs to be fired and restricted to a profession where he doesn’t have access to firearms.
A dog will lower it’s profile when attacking a person due to stability and hunting instincts. The dog goes low to prepare for an upward lunge to the throat or soft underbelly(this comes from the species instinct of hunting deer and other larger animals). When a dog raises up, it’s when it is challenging another dog for territorial or mating reasons to make itself appear more intimidating to the other dog.
Sorry, the cop was in the wrong here. He should never have unholstered his sidearm. If he was worried about being bit, he should have gotten back in the car. End of story.