leave written instructions on what your routine is, their likes/dislikes,
This made me smile - we had to put our lot in quarantine (before Pet Passport) on our return from Canada - 7 of them and believe me the 'instructions' they went in with was like War and Peace. Fact is they did NOTHING like anything I'd written about!!! If it give you peace of mind, as it did me, by all means do this, but don't expect them to stick to what you suggest, or your dogs to either!!
Fact is if you are only going for a week, your dog will be fine - look on this as 'his holiday'. If you have picked a reputable Boarding kennel, and gone in to visit, checked out the dogs in there etc., they are bound to know how to deal with a dog who goes off food etc. There is always so much going on in a Boarding kennel, dogs coming and going, barking - he'll probably come home and zonk out!!
Please don't take a bean-bag bed in there (nightmare for kennel owners because so often dogs rip them out) or any bed you 'value' because again your dog may take it into his head to rip it up. Also with diet ..... the kennel I worked in (while my lot were in quarantine partly) were particularly bad about giving boarders the food their owners came in with. Do make sure they WILL give your dog his normal food - too many don't and use the kennel food - same for all of them.
A good kennel will ask you for all the details suggested here ..... vet's name, a contact number if possible etc. And they WILL want to see an utd booster record.
Do your homework re the kennel you are going to use, and go off and enjoy your holiday.
ps For known upcoming stress situations, Kalm Aid is good but frankly I'd not bother really - again a good establishment should be well used to dealing with any kind of dog they board.