Endothall Herbicide Safety for Dogs: What Pet Owners Need to Know

EPA Registration & Label Requirements

Endothall (trade names: Aquathol, Hydrothol, Accelerate) is EPA-registered for aquatic and terrestrial weed control. Label is law—applicators must follow re-entry intervals, PPE, and posting requirements.

Acute Toxicity to Dogs

• Oral LD₅₀ (rat): ~50–200 mg/kg (moderately toxic).
• Dermal/Inhalation: Low absorption, but irritation possible.
• Clinical signs: Vomiting, diarrhea, depression, respiratory depression, cardiac effects at high doses.

Practical Precautions

• Keep dog off treated area ≥24 hours (longer if label specifies).
• Request MSDS/SDS from property manager—legally required upon request.
• Wash paws after any potential contact.
• Report concerns to state pesticide regulatory agency if application seems off-label.

Environmental Fate

Rapid microbial degradation in soil/water (half-life days). Low bioaccumulation. MCL in drinking water: 0.1 ppm.

While endothall is legal when applied correctly by certified applicators, minimizing pet exposure is prudent. If your dog refuses to urinate on treated turf, that's a behavioral aversion—respect it and provide an untreated area.