Hi Susie!
Wow! I cannot imagine what it would be like to try to keep dogs cool in Florida in the summer! I always wondered about people that have northern breeds, like huskies or malamute, and live in the south....what do they do??
Anyway, I live in northeastern Ohio, and while our summers are pretty short, they can get pretty hot and humid. I keep wading pools, those cheap ones they sell for kids at the discount stores, filled with fresh, cool water for my dogs to jump in whenever they feel like it. When I take them out for walks, I try to route the walks somewhere near water where they can take a swim, even for a few minutes. There are so few places around here anymore where dogs are allowed to go offleash, so, I have to admit it, I sneak to places when there is no one else around and let them off leash to take a dip. I always rinse them off with fresh water when we get home, too, or even give them a bath, much to their discontent.... I know you probably have to be careful of alligators and snakes (shudder!), so you would be better off sticking to a pool in a controlled environment!
Providing shady areas helps, and also dirt that they can dig and burrow into. They love cool dirt! My border collie mix, Annie, loves to go under bushes and dig a 'bowl' to lie in. All that I see is her nose sticking out from underneath. If you're worried about Eli destroying your landscaping, you could set her up with her own "dig box" in a shady area. She would love it!
I have read that if you are going to shave their coat, to not go too close, because they can then get sunburn. You should leave about an inch of fur.
Hope this helps!
Rachel