Walking a dog is not essential. If there are time constraints then, the obvious answer is "don't get a dog". But if you have a dog and find the time to walk the animal is restricted them the best excercise would be swimming. A 10 minute swim is equivelant to a one hour walk.
Another quick one is to use a flirt pole. The manic chase, twisting and jumping, excercises the dog very quickly and in ways that cannot be achieved by just walking or chasing a ball.
Then if the owners are really lazy, there is the treadmill.
The days of saying "I did not have the time to exercise my dog today" are gone.
Border River Pet Resort