Step 1: Go to http://www.maxandneo.com/account/login and log into your account.
If you don't have an account, please create one using the same email address that you placed your order with.
Step 2: Click on the link that says Manage Monthly Collar Subscription.
Step 3: Click on Manage and a dropdown box will appear. Click on Change Collar Size.
Step 4: Click on the button below Change Size.
Step 5: Choose your new size and click on change size.
Step 6: Click on Confirm