*Always have your dog id-tagged. Often people will make a temporary tag with the campsite/accommodation address on it, in case the dog runs into the surrounding area. Micro-chipping is also a popular option (as are QR coded tags witch allow someone to scan and call you from their smart phone).
* Always pick up and dispose of any dog poo (so take some biodegradable pooch bags with you).
* Have plenty of water on hand for when they get thirsty. Depending on the destination you may need to take your own water supply. While there may appear to be fresh water sources, these may contain bacteria and other nasties.
* Pack a rope or chain that you can tie your dog up with around the campsite. If it's long enough your animal will be able to enjoy a wide scope of the campsite but still be safely under control.
* Prevent the animal from jeopardizing the safety of any wildlife or person.
* Taking a bed with you is a great way to make your dog comfortable while away. It always brings a sense of familiarity to the new surroundings.
* Your dog should be fully vaccinated before departing on your camping holiday because they may come into contact with unvaccinated animals.