No, the destrier horse doesn't exist in it's original form anymore. The modern draft breed of horse, known as a Percheron, may have in part descended from the original destrier. However, Percherons are believed to be taller and heavier than the average destrier used to be. Shires are also supposed to be descendants of destrier, but there is some uncertainty around whether or not they can be considered true descendants.  Modern attempts to reproduce this ancient horse breed involved crossbreeding of an athletic riding horse with a light draft type. The result is a type of horse known as a crossbred that includes both bloodlines of the two breeds. The "Spanish-Norman" is a well-known example. The Warlander is another popular crossbred.