I have a 6 year old black female that has just laid down on me one time the last 3 seasons while pheasant hunting. It first occurred in 2018. While pheasant hunting she just started limping on her left from leg and laid down. It was after about a 30 minute hunt in heavy CRP and was the first hunt of the day. It was the second or 3rd hunt of the year. My son carried her back to the truck and we got her watered and took her home. When we got home she exploded out of the truck and was fine. Last year, I took her on the second or third hunt of the year and the first spot we hit that morning was heavy CRP and after about 30-45 minutes she just stopped and I had to lay her down. She was limping again on the left front leg. I laid down with her for about 45 minutes or so. The she was able to get up and she limped her way back to the truck. We were about a 1/4 mile from the truck and I was by myself. After water and 30 minute rest she was fine. We hunted about another 21 days after that and nothing. It was cold that morning with some snow on the ground. Well this morning it was about 45 degrees and the same thing happened again. We rested her for 30 minutes and she was fine. It has happened one time the last 3 seasons. She is the hardest charging athletic female I have owned. Very energetic at all times. Both parents were EIC clear. Not for sure if that is what it is or if she is just so excited and goes so hard that she just runs her self out. The first 3 seasons we had nothing like this. We thought that she had injured her leg the first time it happened but that was no the case. She always had her heat cycle once a year the Saturday after Thanksgiving like clockwork. However I had her spayed in July so I don't think the heat cycle had anything to do with it. Just curious as to what you all might think or suggest.