Another thread got me thinking about how our training session went (or didnt) this morning. On Monday, we had one of the best days we have ever had. We did a nice, not huge, triple and were spot on the "taught" blind we are starting to work on. I was so proud, my boy out did his much more advanced training buddies on that day. It was about 79* at 7:30 AM, a little humid but not yet stifling. This morning, out at the same time, it was 81* with noticeably greater humidity. My poor dog could not do ANYTHING right! He hunted the short mark on the triple, would not even look in the general direction of the same blind we had been using, when I blew a "sit" whistle he came in, when I blew a "come in" he ran away and jumped in the creek. Was he having trouble because of slight increase in heat index, or was he just blowing me off because he wanted to play in the water? I ended up having to burn him bad just to get him to sit and come back to me. We did finally accomplish the blind by me taking him up to within 10 feet of it, but none of it was remotely like Monday. Is it heat or attitude or combo of both? Should I just not go when we reach this particular heat index?