Question: can dewormer cause seizures in dogs?
Answer: In the author's experience of toxins causing seizure activity, it has been from the oral ingestion of spot-on flea and worming products such as ivermectin or moxidectin. Moxidectin is used in veterinary medicine for heartworm prophylaxis and large animal endoparasitism (Crandell & Weinberg, 2009.