1) Ask the handler what he expects of you before leaving for your task.
2) The handler is in charge of tactics during the search. He knows how to position and work his dog to her best advantage; you do not.
3) Do not get between the handler and dog. This obscures the handler's view of his dog's alerts. Some SAR dogs get very miffed when you do this. The best traveling position is a couple of yards behind the handler.
4) Do not talk to the dog while she is working, and keep general chatter to a minimum.
5) Watch the dog when the handler cannot; if he is fiddling with his radio and you see the dog alert strongly, let him know. If the dog makes a dash for the highway, call her!
6) Keep the search party well bunched; some SAR dogs become disturbed when "their" people start straggling or spreading out, and will waste time trying to herd you together instead of searching. These dogs don't want to risk losing another one!
7) Be prepared to hold the handler's place. He may ask you to remain stationary on the grid or trail while following up a dog alert. This will ensure thorough coverage of the area, and is not an insult. Mark this spot and the dog & handler's direction of travel on your map, flag the position, and be ready to follow in if they signal a find.
8) Learn to be wind-aware. A change in air-movements may necessitate a change in tactics. Be ready to document these changes and their times on your map. (The handler may prefer to do this.)
9) Be safety-conscious. A highway, hunter, or homeowner that may pose an inconvenience to human searchers could spell death to a dog. Make the handler aware of these hazards.
10) Act like a searcher. Use your training to notice and evaluate visual and auditory clues. Employ attraction if feasible -- many SAR dogs aren't fazed by you whistling or calling to the subject. If you would investigate something on a regular ground search, do it, even if the dog has ignored it.