No more than other breeds and less than most.

 If you remember that they are an intelligent breed and provide them with things to occupy them when you are not available, generally it isn't a problem.

Dandie Dinmont Puppies are no different from any other species of youngster - everything gets explored by putting it in their mouths. If it tastes good they will have a gnaw on it. This phase in a Dandie's development passes with love and patience from you, the human.