Question: what are the side effects of using nexgard on dogs?
Answer: Since the release of NexGard, adverse events that have been reported for dogs are listed here in decreasing order of reporting frequency: Vomiting, pruritus, lethargy, diarrhea (with and without blood), anorexia, seizure, hyperactivity/ restlessness, panting, erythema, ataxia, dermatitis (including rash, papules), ...