How easy is it to book?
The more established and reputable dog boarding facilities will have online booking options. This makes it easy for owners to book their dogs in, and to make changes to a booking. These systems are similar to booking a hotel or a flight online.
Some facilities will ask that you book by phone, or by email instead. If that is the case, ensure that you have a confirmation email of some kind, and that you know how to make changes to your booking if you need to.