The next time he does this, see if he has eaten anything different... getting into dog food, table scraps etc. my friend's dog does the same exact thing and it is food allergy related. My teacup poodle did this and it acted like seizures. He was 15 years old however and it just started happening and continued till he died at the age of 16. then....Could your kitty be diabetic and perhaps have high or low sugar??