How do I link the amount of dogs I can sit, board, and walk?

You can indicate on your calendar how many spots for each service you have available. Once you get a boarding client, go into your calendar and alter the other numbers. Click on the first day of the stay, show the dates involved, then go down the list and change the numbers. I do this all the time because I only take in one dog at a time, so if I get a boarding client I can't take in daycare or do house sitting.