The product I usually buy was not available at my store so I purchased Sergeant's Gold (9lbs to 20 lbs) for my two dogs. I applied the product as instructed and within 30 minutes my two dogs (12 lb Silkie and a 20 lb King Charles) were suffering. The Silkie started whining, twitching and scratching and the King Charles started screaming anytime he tried towalk. I quickly put both dogs in the sink and tried to wash off the product. It seemed to help the Silkie, but the King Charles continued to scream in pain any time he moved. Two... read full review »