you will need to have vaccination certificate for your dog and kennels require kennel cough vacine up to date as well as the usual distemper, parvo, leptospirosis, etc. bring some familiar bedding & maybe a chew toy. For longer stays, ideally the dog will have had an introductory visit beforehand of just 1-2 nights. As everyone else says, best to get a recommendation. Otherwise, it's best to visit the kennels beforehand, see that they are clean and secure and the people okay to deal with. A friend said the kennels I use depressed her, reminded her of the pound, but I know my dogs are okay there even though they don't have home comforts. Prices vary, rarely below £7 a night - again you'd need to find out what's the norm in your area.