One way to keep your dog interested on the treadmill is to vary the exercise that they do. Vary the speed at which they walk, the incline or decline where possible, and the length of time that they are on the treadmill. If you are using the treadmill as part of a weight-loss or recovery program, then changes in the exercise should be checked with your veterinarian. One of the easiest ways to keep your dog interested in the treadmill is to change its position and give them a range of different views while there are exercising.