My Cavalier King Charles Spaniel started acting very strange within 24 hours after applying Frontline Plus. She became very agitated and started yelping every time she moved. Took her to vet and they said it wasn't a reaction! She tried to rub against the furniture, shook her head a lot, and now she has started vomiting. We have washed her in Dawn to remove the oil from her skin. I am very concerned about her because now she seems very lethargic and disoriented. What can I do to help her?

Take her back to the vet or go to a different vet