Depends!!!!!!! During Katrina and Rita deployments heat and humidity were serious challenges. A search dog giving you 100% from the time you land at a remote Landing Zone till you are picked up at sunset miles away can easily require 3 gallons of water and Sub Q fluids. Water is 8.34 pounds/gallon. You should have a harness available to fly and if the dogs are working close to a fall hazard a harness and tag line is important. With a significant increase in their physical activity most dogs are challenged to take in enough calories during long searches. Since pick up at the end of the day is not guaranteed a handler always needs to carry food for an additional 24 hours. Add in a radio, extra battery, GPS, food for handler, possibly a sleeping bag, ground cloth, rain and/or cold weather gear, first aid kit and possibly a dry pad for your dog to lay on during rest periods.