Doberman dogs are pretty healthy dogs as long as you keep them healthy by taking them to the vet, feed them properly and get them plenty of exercise.
But Dobermans do have a serious health condition that they're more prone to than other dogs which is cardiomyopathy that causes an enlarged heart.
Dobermans are also more prone to developing cancer than a lot of other dogs as well but other than that they're just as healthy as many other dog breeds.