  Fermions with magnetic charges can contribute to anomalies. We derive the
axial anomaly and gauge anomalies for monopoles and dyons, and find eight new
gauge anomaly cancelation conditions in a general theory with both electric and
magnetic charges. As a byproduct we also extend the Zwanziger two-potential
formalism to include the theta parameter, and elaborate on the condition for CP
invariance in theories with fermionic dyons.
