Nothing but hysterics finding something to complain
The handler, even in its poorly manipulated footage, was clearly treating the dog well. The dog was scared and he pulled him out. He was encouraging the dog to do the scene but pulled him out when he didnt want to do it.
Then in the later portion of the video, the water did push the dog down briefly for less than 5 seconds but they were getting him out, not pushing him down to drown.
Anyone that says the handler was drowning the dog is a braindead idiot that shouldn't be allowed near pets.