Try to make the transition as comfortable and stress-free as possible for the puppy. Before your doggo goes off to the boarding facility, put a list together of absolutely everything the kennel staff should know about them.
All vet details.
Allergies.
Feeding routine.
Meds and health supplements your dog is on (with all instructions and dosage).
Emergency contact information.
A note of microchip information.
Any behavior issues and how to prevent them.