I concur with everyone else. Newfs have lower energy levels compared to other dogs and that is one of the reasons why we got one. Drake has little energy bursts, especially when he first gets to the dog park. He will do the figure 8 "crazy run", for a minute or so and then he starts slowing down. They really don't need a huge amount of exercise and swimming is best if at all possible. It allows them to exercise their legs without stressing their joints. I wouldn't worry too much about them getting enough exercise, anything is good. Something I do that seems to wear Drake out very quickly is I throw him a ball uphill. Running uphill tires Drake out in much less time. Just something to consider. Find a ball or toy that your dog can't resist and try it, it works! Sorry about the dysplasia though, hopefully it isn't too problematic. That might make running uphill hard.