The only services visible to clients are those chosen (or "mapped") in ADMIN > Client Services > Client Services List. This page allows you to choose which services you let clients pick for themselves and how they are labeled (you will want shorter labels for layout reasons). For example, rather than confusing the customer with many Dog walk alternatives, you might simply offer "Dog Walk" and map it to your "Dog Walk -30 minutes". Then, when you are setting up the EZ schedule from the client request, it is easy to change over to another service such as "Dog Walk - 30 minutes - frequent customer" if desired.
Please review the Client Access Preparation Checklist