Dachshunds are odorless and exceptionally clean dogs. The Miniature is mature by 12 months of age, while the Standard may not be fully mature until he reaches 18 months of age. Dachshunds are exceptionally long-lived dogs, with many living until 12 to 14 years of age. Regardless of size or variety, the Dachshund is easily maintained and managed, thus making it a most desirable companion.