  This paper explores hydrodynamics and hydrostatic of a star in post-Newtonian
approximation of massive Bran-Dicke gravity. We study approximated solution of
the field equations upto $O(c^{-4})$ and generalize Euler equation of motion.
We then formulate equations governing hydrodynamics, stability and instability
of the system. Finally, we discuss spherically symmetric stars for a specific
barptropic case like dust, cosmic string and domain wall in this scenario.
