A simple rule of thumb is to not work a dog in areas of heavy cholla. In areas where the cholla is not so prevalent, it may be feasible to work an area search dog, however, working a trailing dog on tether may be difficult because the line may pull the cactus clumps into the dog. Yuccas are often encountered as many species are found throughout the desert. The blade ends of many yuccas are like daggers whose tip may break off and stay embedded in the dog. Small barrel cacti that may be hidden from view in the grass are also a hazard.
Poisonous animals are another concern of the desert searcher.
Rattlesnakes and scorpions require caution. You must be alert for snakes in cool areas during the day and in warm areas at night. Desert snakes are more active in the spring and fall. They tend to disappear when the temperature drops during the winter months. Slopes, brush, and crevices are likely spots to find snakes.