Some German shepherd puppies ears stand up as early as 7-9 weeks old. Do not be alarmed if your pup's ears don't stand until 5-6 months of age.Unusually larger ears may even take longer. 1  Most often if your puppy is teething this can slow the process as well.o not be alarmed if your pup's ears don't stand until 5-6 months of age. Unusually larger ears may even take longer. 1  Most often if your puppy is teething this can slow the process as well.