\begin{pspicture}(-.2,-.5)(3.5,5)\showgrid
  \rput(.5,.5){\rnode{A}{\psframebox{Cat}}}
  \rput(3,4.5){\rnode{B}{\psframebox{Dog}}}
  \psset{coilarm=.01,coilwidth=.3}
  \nczigzag{A}{B}
\end{pspicture}