she ate ivermectin for horses like maybe a hour or two ago
Ivermectin, particularly in formulations designed for horses, can be extremely toxic to dogs if ingested in large quantities. Given that your Labrador retriever has consumed ivermectin intended for horses, it is imperative to act swiftly.
Symptoms of ivermectin toxicity in dogs can include vomiting, diarrhea, lethargy, drooling, tremors, seizures, and even coma. Since it has only been an hour or two since ingestion, inducing vomiting might help to expel some of the drug from her system. You can attempt this by administering a small amount of hydrogen peroxide (1-2 teaspoons for a dog of her size), but please proceed with caution and only if you feel confident in doing so.
However, due to the potential severity of ivermectin toxicity, I strongly advise taking her to a veterinary hospital immediately. There, professionals can provide essential treatments such as activated charcoal to prevent further absorption of the drug, IV fluids, and medications to manage symptoms.
It is crucial to get her to a veterinarian as soon as possible to ensure she receives the appropriate care and monitoring. If you have any further questions, please feel free to ask. Thank you.