
Storm damage is rarely why a dogwood comes down — it is short, low, and its horizontal branching sheds snow and ice reasonably well. What actually breaks are limbs already hollowed by dogwood borer or killed by anthracnose, which snap in ordinary wind because they were dead first, so a dogwood limb lost in an ice event should be treated as a symptom worth investigating rather than just debris to clean up.
Prune in late spring right after bloom or in dormancy, and keep it minimal — dogwood needs very little cutting and every wound is an entry point for dogwood borer. The species trap is that the highest-value work is not in the canopy at all: pulling a proper mulch ring out toward the dripline, kept off the trunk flare, does more for a dogwood than any amount of pruning, because it keeps the string trimmer and mower deck away from the bark the borer is looking for.