In most cases, rechecks for spay/neuter are scheduled same day or next day. Therefore, any important information the client should read should appear in the confirmation email. The reminder email would be sent if a recheck is scheduled more than one day in advance.
EMAIL RECHECK REMINDER
In this example, you can keep the reminder generic.
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Dear #Name#,
This is a reminder that #AnimalName# is scheduled for a recheck on #Date# at #Time#. Should anything change and you are unable to keep the scheduled time, please let us know as soon as possible.
WHAT YOU NEED TO KNOW
Date: #Date# at #StartTime#
Location: XXX
Thank you,
Paw Partners Spay/Neuter & Wellness Clinic