  We re-analyze a possible ambiguity in the application of dimensional
regularization to Einstein-Gauss-Bonnet gravity, arising from the way one
treats the Gauss-Bonnet term. It is demonstrated that the addition of such a
term to the action gives rise to a non-minimal graviton wave operator, but does
not produce new on shell divergences at one loop order in d=4. However, from a
d-dimensional perspective the Gauss-Bonnet term is shown to generate new
divergences in the form of the six-dimensional Euler density. The conjecture
that one would next produce the eight-dimensional Euler term is shown to be
false.
