I just don't agree with that. If you know your pittie has been socialized and does fine with other animals then you shouldn't treat it like you expect it to bite, or maybe it will bite because its reacting to your body signals and being on end all the time. Dogs learn how to be dogs and obey "dog" rules by learning from other dogs. There are limits to how much humans can communicate with dogs. Not to mention that mental stimulation is way more important to mental health than straight physical exercise. Running next to a bicycle with no ability to sniff and take things in is only enough for the body, nothing for the mind. If you were trapped in a room with nothing but a treadmill to run on you'd go nuts even if you got physical exercise every day. Put a muzzle on your dog if you want to be perfectly safe against your dog biting. My dog has been attacked by a beagle at the dog park. A beagle! No dog is 100% safe at the dog park but any breed has the potential to be 90% safe. You can't live in a bubble and its inhumane to keep a dog in a bubble just because of its breed. Might as well put all pitties down than have them have that quality of life. I'm not saying they should go to the dog park per se, but they should get mental stimulation and walks in places where there are scents and sights of other animals is great for that. Its not something that should be off limits to all pitties as soon as they are born.