  Non-supersymmetric string models are plagued with tadpoles for dynamical
fields, which signal uncanceled forces sourced by the vacuum. We argue that in
certain cases, uncanceled dynamical tadpoles can lead to inconsistencies with
quantum gravity, via violation of swampland constraints. We describe an
explicit realization in a supersymmetric toroidal
${\textbf{Z}}_2\times{\textbf{Z}}_2$ orientifold with D7-branes, where the
dynamical tadpole generated by displacement of the D7-branes off its minimum
leads to violation of the axion Weak Gravity Conjecture. In these examples,
cancellation of dynamical tadpoles provides consistency conditions for the
configuration, of dynamical nature (as opposed to the topological conditions of
topological tadpoles, such as RR tadpole cancellation in compact spaces). We
show that this approach provides a re-derivation of the Z-minimization
criterion for AdS vacua giving the gravitational dual of a-maximization in 4d
$\mathcal{N}=1$ toric quiver SCFTs.
