There are no "shots to prevent demodex mange". Demodex mange is
caused by a parasite. Prevention of demodex includes minimizing
stress for the animal, providing a balanced diet and vaccinating
and deworming appropriately to help prevent the immune system from
becoming overworked due to infection. All preventative measures for
demodex are aimed at keeping the immune system functioning well so
that the number of demodex mites are kept in check.