Keeping horses in south Florida is a little different from in other parts of the country.  Heat, humidity, and rare freezes make fighting fungus, mold, and parasites a constant battle.  Our soil is mostly fine sand, differnt from the sand found in other parts of the United States.  The internet is a great resource, just make sure the advice applies to your area of the country.

Americans tend to like our horses heavier than is healthy for them.  Think you see a starving horse in the neighborhood?  This article illustrates a good way to check any horses condition.  Taking a horse safely back to normal weight from a 1 or 2 score can take up to a year.  Please consult your vet and your local Animal Care & Control officer if you are personally taking in a starving horse.
How to Condition Score a Horse

Safely Refeeding the Rescue Horse

Equine Studies Institute with Dr. Deb

New to keeping horses in Florida?  You may find the following articles to be helpful.
Disaster Guide from Univ. of Florida - see index for horse info

Horse 101:  Conformation and biology

External Parasites on Horses in Florida

Sand Colic in Florida: A Preventable Problem

Best Management Practices for Florida Equines:  from the Florida Dept. of Agriculture & Consumer Services

Poisonous Plants in the Southern United States

Horse Health Articles from the American Association of Equine Practitioners