Taken from the PDCA website
Dexters are classified as a dual-purpose breed; used for milk and beef. However they are often listed as a triple-purpose breed, since they are also used for oxen.
Beef animals mature in 18 months and result in small cuts of high quality lean meat, graded choice, with little waste. The expectable average dress out is 50 to 60 percent and the beef is slightly darker red than that of other breeds.
Dexters produce a rich milk, relatively high in butterfat (4%) and the quality of the milk overall is similar to that of the Jersey. A milking cow can produce more milk for its weight than any other breed. The daily yield averages 1 1/2 to 2 1/2 gallons. Yields of cream up to one quart per gallon are possible. The cream can be skimmed for butter or ice cream.