I've hunted behind several SMP's and have seen a wide variance in their coats. Some have had rather short hair and others have been very bushy. Also the color of the coats can also vary. Most are a liver roan color but you will see some that are predominately white in the body. I would think that if you could fine a dog that had a shorter, white coat it would maybe take heat a little better. I have a friend with a SMP and can't say I've ever noticed any difference in the dog's ability to with stand heat compared to my Brittanys.