Abstract: An apparatus for shielding a fence post from foreign elements includes a collar section with integral sidewalls, one detachable sidewall, a base extending about a perimeter of the collar section, and a mechanism for preventing fluid from traveling distally and medially of an outer wall of the fence post and an inner perimeter of the collar. The detachable sidewall is provided with oppositely spaced tongue portion and the collar section has a pair of grooves formed therein. The tongue and groove portions are slidably engageable with each other so that the apparatus can be assembled and disassembled by moving the detachable sidewall along a substantially vertical plane. The fluid blocking mechanism preferably includes a rubber seal contiguously positioned medially of the fence post and collar section.