During my ToD, we had a Dog & Handler team with us on one sweep around the Rockpile. It was a terribly hot day, trudging through the elephant grass caused several heat casualties amongst our troops. With each heat casualty we would leave a fireteam for security, with instructions to catch up when the downed Marine was able to move on. This went on with about half a dozen downed Marines, but not a single Marine was medevaced. Towards the late afternoon, the Dog we had with us started bleeding from the nose. We halted the sweep immediately and secured a medevac for the dog. Just showed us how expendable we were as compared to that dog.