Thanks for your reply. I think what caused this problem is the fact that the product I have used for flea control for years is no longer working as advertised Advantage. I have now purchased Frontline to use. Hopefully that will work efficiently. I probably am just to anxious to see the guy get some relief. He hasn't slept much in a couple of days. I love this old 12 year cat dearly. If no good results by tomorrow I will have to contact the Vet.