We have a 7 year old neutered tom. Recently he has been licking dirt and eats sporadically. A few weeks ago we had a flea collar on him, but took it off after he started becoming unsteady on his feet. It solved that problem. However, shortly after that he started licking dirt and ate less. Does he still have flea meds in his system and it is causing that? Or, does he have a virus or unrelated condition? Also, he may be constipated. Would an eyedropper of stool softener work?