Received post exposure rabies vaccine last month finished 29nov. cat nippled headphones leg unsure if it bit. 22dec. cat normal 29dec, need boost?

Doubt it: You should contact your local health department who tracks regional rabies activity. Cats unless feral are generally not considered a rabies risk. A significant wound from a wild or un-captured animal where rabies is suspected would usually trigger a booster recommendation, only because of the significance of the disease. The primary series provides protective antibodies for 2 yrs.