I will never use this drug again. My 7 year old Chihuahua almost died from it. He started foaming at the mouth, went into a seizure like state, stiff as a board. I thought he was dead. It took a good 10 minutes before he could try and sit up. The Vet did bloodwork on him but refused to allow me to pay for the visit. He expects the drug company to pick up the bill. It was a horrible experience, one I will not revisit. Beware people.