Congrats! Exciting! There was dock diving on a TV at an establishment a couple weeks ago. It was neat to see, and was the kind where they dive to try to reach the article suspended out there.
Of course, it's the smaller dogs (of medium breeds) that do well at these sports, so you have what it takes there; and it's great to see a Doberman represented in a water sport!
The scream? Yeah. You should've heard what Oji would do when I walked him and a family member was in front of him, or back when I used to take him to the dog park and we were walking up the sidewalk toward the enclosed area, or when I had him on a heel off leash when we were walking to the park to do retrieving. Sometimes sounded like an injured dog or one being abused.