Federal & Postal Disability Retirement from OPM: Holding a grudge
Doesn’t holding a grudge imply a certain level of intelligence? Do other species have the capacity for holding a grudge? Certainly, some breeds of dogs do — of getting into a growling match, or one of those “baring the teeth and gnarling sounds”, but with very little harm done; but if it is not “finished”, will come back and engage in some more noisy combat until one or the other is satisfied that neither a grudge nor a kiss will any longer be necessary. […]