In ancient societies, a person’s wealth was defined by the number of cattle he or she owned. Cows have also long been a symbol for love, nurturing, kindness, and generosity. Dreaming of a live, happy cow, especially one with a calf, is almost always a positive symbol, and other symbols in the dream will shed more light on exactly what’s going on.
A dead, sick, or ailing cow, however, indicates that future plans may be in jeopardy, and action needs to be taken.
See “Bull”, “Calf”.