Select a dog you can afford and make him race. The dog has different properties. The Fitness effects all the dogs attributes, a fit dog will run quicker, be better behaved, and have faster reactions. Overall Quickness is determined by a combination of speed and stamina. On longer races stamina is more important. Course conditions also matter, the wetter a course is the more stamina is important. A good rating here means your dog is more likely to get a vital good start. The attitude determines how likely the dog will play up and not start a race. You can also select a trainer for the dog.