I've owned dogs all my life. Most recently I owned two American Bullies weighing in at 40Kg each and I have never witnessed power like that before. They were different from the terriers, labs and german shepherds we owned previously. These dogs did not appreciate other dogs as much as I was very attentive when walking them outside. It is crucial to understand the dogs you walk with. They each have a personality and a tendency. I am also an athlete and love a good run. I would definitely work well with overly energetic pets or pets in need of exercise.