How can I know for sure. I see NO fleas on him. I have upped his organ meat and he has eaten about five salmon heads in the past month (that was the most I could get him to eat - they were huge though!). I bathed him and did a vinegar rinse at the end. I have not put the flea medicine on him again. He is itching like crazy! So, I need to find out for sure if he has any fleas so I can give him flea medicine again if that is the case. Maybe the changes I made above solved the original itching problem but now that I stopped giving him flea medicine he has fleas? I can't seem to find any though.