I think it'd be better to invest in Frontline or something similar rather than to put your dogs outside, especially in Florida. When we were there last May the temperatures were already up to 95 outside.
I'm in NC, and we have an awful tick problem too, but as long as I treat the yard in the spring and make sure the dog's Frontline stays on in a timely manner, we may find 1-2 on her in the course of the season.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry