At the lower altitudes, you'll be hiking in the desert, where the temperature calls for a good supply of water. At altitude, where you may not be hot,however, you still need water because your body needs more fluids at altitude. Don't forget to bring lot's of water for your Dogs also. Never underestimate the amount of water you will need, on a per person basis. First Aid Kit You never know what might happen out in the woods, so always carry a basic first aid kit, with any luck you'll never need it, but bring it anyway.
Some people feel hiking boots are unnecessary for most hikes.
Regardless, wear boots when hiking in the desert, if for nothing else than to protect your feet from rocks, cacti, and more importantly to keep your feet from getting wet. Make sure your boots are lined with some type of waterproof material. Even if you know the area to be hiked bring a good map and a compass anyway, make sure you know how to use both. I really like the headlamps they have now, very light weight and inexpensive. Sunglasses Always a good idea to bring two pairs, regardless of where you are hiking.