1. Availability of your dog's regular food in the location you are visiting. Check ahead to see if the same suppliers are located where you intend to travel. If not, who does supply your brand and where are they located in relation to where you are staying? If you feed raw, find out where pet stores, butcher shops and grocery stores that supply your type of meat are at your destination. Use your regular treats, as treats your dog has not eaten before may cause digestive upset.
2. Keep the food (and treats) in its original bag so you have an ingredients list to refer to if you find you have to do an emergency food switch due to no supply. Try to match the list as closely as possible.
3. Crossing Borders: if you are crossing international borders, be aware that different countries have different laws regarding what pet and human foods they will allow in. And find out what Canada will allow back in as well. Do your research before you travel. If going into the US from Canada, for example, kibble and treats that are not in their original bag will most likely be confiscated and thrown out. Anything with beef in it that is made in Canada (or any country other than Canada) will be confiscated. US brands that have been imported into Canada are usually exempt. (i.e. if they recognize it as a product originating in the US, they are more lenient.) In any case, it's a good idea to check into #1 above in case they take it from you.
4. Train your dog to eat a variety of foods at home so he can eat them if you run out while away from home. For example, if you run out of food at your destination and it will be longer than the dog missing one meal, it may safer as well as more convenient to cook up some ground beef or chicken breast with rice or oatmeal and feed that for a few meals to tide the dog over. Working dogs should not be skipping meals as they rely on the energy to keep working both mentally and physically. If the dog has eaten these foods before, he shouldn't suffer digestive upset. Staying in a hotel with a dog who has diarrhea is no fun and can cost you money for clean-up. And you may not be able to tell if he's picked up a bug or eaten something he shouldn't have.
5. If you feed raw, and are crossing an international border, consider switching back to kibble or canned for convenience. Fresh meat, fruits, and veggies in any form are not allowed to be taken across most borders. Some forms may be allowed but look into the details (dehydrated, canned, processed, etc). The quality and safeness of raw meat (additives such as salt, dyes, hormones, antibiotics, and parasites) in another country may come into question, depending on where you travel.
Keep these tips in mind and you will enjoy your trip, knowing your dog can eat safe, familiar food.