Terro ant bait is mildly toxic to dogs, but the small amount of active ingredient in a single bait station is unlikely to cause serious harm. The active ingredient is borax (sodium tetraborate), which makes up about 5.4% of the liquid bait. The rest is mostly sugar water, which is exactly why dogs find these traps so appealing. Most dogs that eat a Terro bait station experience nothing more than mild stomach upset.
Why the Dose Usually Isn’t Dangerous
Borax can be harmful to dogs, but the toxic dose is relatively high. Studies show that the lethal dose in dogs is greater than 974 mg of borax per kilogram of body weight. A single Terro liquid bait station contains a very small volume of liquid, and only a fraction of that is borax. For a 20-pound dog, the amount of borax in one or even several bait stations falls far below the threshold for serious poisoning.
The ASPCA has specifically addressed ant and cockroach baits, noting that the amount of bait in these products is so small that stomach upset is typically the only problem seen. That said, smaller dogs are at higher risk simply because it takes less of any substance to affect them, and eating multiple bait stations increases the exposure.
The Plastic Casing May Be the Bigger Problem
If your dog chewed up and swallowed the plastic bait station itself, that’s worth paying attention to. Sharp plastic fragments can irritate the digestive tract, and if a dog swallows a bait station whole or in large pieces, it can potentially cause a blockage in the intestines. The ASPCA notes that the plastic packaging is often a bigger concern than the bait inside it. Watch for signs like repeated vomiting, refusal to eat, straining to defecate, or a painful belly in the hours and days following ingestion.
Symptoms to Watch For
If your dog did ingest enough borax to cause a reaction, symptoms typically appear within 30 minutes to two hours. The most common signs include:
- Excessive drooling or mouth pain
- Vomiting and diarrhea
- Abdominal pain
- Lethargy
- Shivering or tremors
- Uncoordinated walking
In rare and severe cases, borax ingestion can lead to liver and kidney failure, but this would require a much larger amount than what’s found in household ant bait traps. If your dog ate one bait station and seems completely normal after a couple of hours, serious toxicity is very unlikely.
What to Do Right Now
Start by checking your dog’s mouth for any plastic fragments, cuts, or irritation. If your dog is drooling uncontrollably or coughing, that warrants an immediate trip to an emergency vet. For dogs that seem fine, monitor their behavior closely for the next two hours. Look for any of the symptoms listed above.
Try to figure out how many bait stations your dog got into and whether the plastic was swallowed or just chewed apart. This information will be helpful if you need to call a vet. You can also reach the Pet Poison Helpline at (855) 764-7661 for guidance specific to your dog’s size and the amount ingested.
Preventing It From Happening Again
Terro baits are designed with a sweet sugar solution that lures ants, and that same sweetness attracts dogs and cats. Placing bait stations behind appliances, inside cabinets, or in areas your dog physically cannot reach is the simplest fix. Terro also makes outdoor bait stakes that can be pushed into the ground in areas your dog doesn’t frequent.
If your dog is the type to seek out anything with a scent, consider enclosed bait stations rather than the open liquid traps, or switch to ant control methods that don’t involve leaving bait at floor level. Gel baits applied in thin lines behind furniture or along baseboards are harder for dogs to access in meaningful quantities.