dog has heat stroke

Our catch dog had a heat stroke last year. The owner then, (he took great care of her, she just got away from him and got deep in the woods and caught a hog) got to her, took care of the hog, took her vest off and laid her in a creek. She came back too and laid there for quite some time. Now she over heats pretty easy, but I started giving her Gatorade before and after catches, and it seems to help quite a bit. After a catch, I always take her vest off, and give her a bowl of it, and she cools right back down. So far we haven't seen any huge side effects from it, but she is still young. Hopefully it doesn't effect her to the point we have to quit hunting her, she is a great catch dog and loves to go.