Instructions
Walk your dog regularly. You can walk your dog approximately every hour, depending on the dog breed. Make these walks as long as possible.
Train your dog in the park. The fastest way to do this to use a mixture of the available events, such as discs and boomerang, although your dog can train for just one event if you prefer one. Start with throwing the item a small difference, and as your dog gets faster in bringing it back, throw it further away.
Take your dog to the gym. The most important activity here is Lure Coursing, where you use a lure to encourage your dog to run, either to you or around a race. Train here regularly, as this makes the most difference to your dogs speed.