Things I got from the video. Dog was scared. The trainer was trying to get the dog to go into the water. Dog didn't wish to. Trainer tries to calm the dog down. Trainer actively tries to prevent dog from falling into water. Trainer tries to lower dog in. Dog clearly not having it. Trainer pulls dog up out of water.
See that last bit? Trainer sees dog isn't having it, pulls dog up out of water.
Then cut.
Then we have divers going after dog. (Which I'm sure is totally not what standard procedure after any kind of stunt what so ever.)
The video doesn't show the dog forced into the water. It shows a scared dog that they want to do a stunt, then cut to its done the stunt. If the dog was forced into the water, TMZ would have shown it.