Most visitors never meet most of this. Florida is a big state and its wildlife changes a lot from region to region - a cane toad is a South Florida backyard problem, a black bear is a central and north Florida one, and a crocodile only matters in the far south. These guides are here for the encounter you do have, not because one is likely.
Fire ants are one of the most common outdoor hazards for pets in Florida, and they are in almost every lawn, park and rental yard in the state. Most dogs that get stung end up with itchy, sore bumps that fade in a day or so, but a dog that lies down on a mound or digs into one can take many stings at once and should be watched closely and seen by a vet if it swells, struggles to breathe or collapses.
The ant in question
The species behind most Florida stings is the red imported fire ant, which arrived accidentally from South America through Mobile, Alabama, around the 1930s and now covers most of the Southeast. UF/IFAS describes the workers as aggressive, reddish brown to black and about 1/8 to 1/4 inch long. They sting dogs, cats, livestock, wildlife and people with equal enthusiasm.
The Merck Veterinary Manual describes how they do it: an ant latches on with its jaws, stings with a stinger that does not detach, and pivots in a circle, stinging repeatedly until its venom is used up. One ant can sting up to 10 times. When a mound is disturbed, many workers pour out at once, so an animal standing in the wrong spot for a few seconds collects a lot of stings.
Why Florida mounds are easy to miss
In clay-soil states, fire ant mounds can stand well over a foot high. UF/IFAS notes that in Florida’s sandy soils, colonies often do not build the sizable mounds you would see elsewhere. A Florida colony may be a low, loose patch of fluffy soil with no obvious opening, or no visible mound at all.
They nest in lawns, around the base of trees and stumps, under pavement and sidewalks, next to buildings, in rotting logs, and even inside electrical boxes and utility equipment. Workers forage more than 100 feet from the nest in warm weather, so a dog can meet foraging ants away from any mound.
The places a traveling dog is most likely to meet them are the places with mowed grass and no one watching closely: rest areas, campground sites, dog parks, hotel pet-relief strips and vacation rental yards.
How dogs and cats get stung
Dogs usually get stung on the paws, legs, belly, nose and lips, the parts that touch the ground or investigate it. The worst cases tend to be dogs that dig into a mound, sniff through it, or flop down to rest on one without noticing. Keep a closer eye on puppies, older dogs and dogs with mobility problems, which cannot scramble away as quickly. Outdoor cats get stung the same way.
In dogs, the Merck Veterinary Manual describes the usual reaction as a raised, red welt that settles within an hour, followed by an itchy red bump that typically resolves within 24 hours. Some dogs develop small yellow pustules with a red ring, similar to the white pustules people get. Merck also notes that true anaphylaxis from fire ant stings is not reported in companion animals, and that most stings resolve with no treatment. That is reassuring, but a dog that took dozens or hundreds of stings is a different situation and may need supportive care at a clinic.
If fire ants swarm your dog
- Move the dog off the mound immediately. Do not stand in the mound yourself while you help; step away first.
- Brush the ants off with a gloved hand, a towel or a stiff brush. They hold on with their jaws, so rinsing alone may not remove them. Protect your own hands.
- Check the whole dog, including between the toes, the belly, the groin and around the mouth.
- Watch for the next hour or two for signs that need a vet.
If the reaction goes beyond a few welts – a swollen face, trouble breathing, vomiting or collapse – go to an emergency vet. Pet Help lists them for the counties it covers so far.
Call a vet or go to an emergency hospital if your dog or cat shows facial or muzzle swelling, trouble breathing, collapse or severe weakness, widespread swelling or hives, repeated vomiting, or if it was stung a very large number of times. Do not give human antihistamines, pain relievers or steroid creams unless a vet tells you to; the right drug and dose depend on the animal, and some human pain relievers are toxic to pets.
Fire ant control without hurting the dog
UF/IFAS is blunt that there is no permanent solution. Treated colonies can recover within 12 to 18 months, and new colonies move in from next door. The recommended approach, per the UF/IFAS guide to managing imported fire ants in urban areas (archived copy), combines broadcast baits with individual mound treatments. Baits work best when applied while ants are actively foraging, on dry grass with no rain expected, and most take one to four weeks to reach full effect. Some growth-regulator baits take months.
Pet owners should treat fire ant products like any other pesticide. Follow the label exactly, keep pets off treated areas for the time the label specifies, and store products where pets cannot reach them. If your dog or cat eats a fire ant bait or gets into a mound drench, call your vet or the ASPCA Animal Poison Control Center at 888-426-4435 (a fee may apply), and have the product label in hand. If you are at a rental, ask the host whether the yard has been treated recently.
After hurricanes and floods
Fire ants survive floods by linking their bodies into floating rafts carrying the queen and brood, and UF/IFAS Extension warns that storm cleanup is when people run into them. Rafts can end up against buildings and in debris, right where people and pets are working and walking. After a storm, keep pets away from floodwater, floating debris and debris piles, and walk the yard before letting the dog loose. Our guide to Florida hurricane preparedness with pets covers the rest of the storm checklist.
A routine that prevents most stings
Before letting a dog loose at a rental, campground, rest area or dog park, take a minute to look over the grass, the base of trees and the fence line for loose soil or ants. Keep diggers away from any suspicious patch, and do not let the dog settle down to rest on unchecked ground; bring a mat or towel. After any swarm, move, brush, check and watch. Save the vet’s number and the ASPCA line in your phone before the trip, and read our Florida wildlife emergency checklist for pet travelers. Owners of older dogs should also look at traveling Florida with a senior dog, and the complete guide to Florida wildlife with pets covers the bigger picture.
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