A good way to increase the amount of times a client uses your services is to pre book them before they leave. Most people wait till their dogs start to look scruffy or sometimes down right matted to make the call to you.
By making their next appointment before they leave your salon they will get their dog groomed sooner and more often, leading to more income for you.
This will also help you avoid those crazy holiday last minute people. Your days will be better scheduled and less stressful.