  In this paper we investigate a new instability of the Lamb-Chaplygin dipole
in a stratified fluid. Through numerical linear stability analysis, a secondary
peak in the growth rate emerges at vertical scales about an order of magnitude
smaller than the buoyancy scale $L_{b}=U/N$ where $U$ is the characteristic
velocity and $N$ is the Brunt-V\"{a}is\"{a}l\"{a} frequency. This new
instability exhibits a growth rate that is similar to, and even exceeds, that
of the zigzag instability, which has the characteristic length of the buoyancy
scale. This instability is investigated for a wide range of Reynolds
$Re=2000-20000$ and horizontal Froude numbers $F_{h}=0.05-0.2$, where
$F_{h}=U/NR$, $Re=UR/\nu$, $R$ is the characteristic length scale of the
dipole, and $\nu$ is the viscosity. A range of vertical scales is explored from
above the buoyancy scale to the viscous damping scale. Additionally, evidence
is presented that the dynamics of this new instability are partially determined
by the buoyancy Reynolds number, $Re_{b}=F_{h}^{2}Re$.
