While I have no personal experience hunting your kind of partridge. KIM's are as susceptible to overheating in 90 degr.+ weather as other hunters/retrievers. Remember the coat at the dark markings get easily 15-20 degr. hotter in sunlight than the white areas. If running streams are not nearby, have plenty fresh water (NOT cold) handy. Have it rest in the shade. This breed is so eager to hunt, that it will not stop untill the point of utter exhaustion is there. So it is up to you to watch your dog. Feel it's head from time to time. If it is too hot for you, it's too hot for your friend.