You can also buy cool coats for dogs. The one's I have you just soak in water and put em on the dog. Then wet it down when it drys out again. I might alwo mention as far as battery powered fans go, if you are staying someplace with power at night, Ryobi make a nice battery operated fan that is rechargeable with a battery that fits their power tools as well. Pricey but better than having to keep buying batteries. Course I guess you could get regular rechargeable abtteries for the cheaper fans too.