954 Hey Kaleb!
Is Sampson in intact? Also, does the dog park actually allow people to throw around balls in there? I don’t even allow that in the puppy class. Almost a guaranteed fight if you have two assertive dogs with no established relationship that BOTH love to play with that one limited resource. Remember, Sampson is not a puppy anymore. And, he is a great example of a rottweiler which is purposely bred to be assertive, protective, not back down to challenges, etc, etc.. These are great dogs but Sampson is not your average goofy Labrador or English mastiff that has been bred down to be a companion pet.
I’ll be back later, have to run, but sounds like it may be partially a case of not completely understanding what is normal expected behavior for an adult male rottweiler. You don’t want to set up Sampson or yourself for failure or getting roasted by a local trainer.