Many dachshunds, especially the wire-haired subtype, may exhibit behavior and appearance that are similar to that of the terrier group of dogs. An argument can be made for the scent (or hound) group classification because the breed was developed to use scent to trail and hunt animals, and probably descended from the Saint Hubert Hound like many modern scent hound breeds such as bloodhounds and Basset Hounds; but with the persistent personality and love for digging that probably developed from the terrier, it can also be argued that they could belong in the terrier, or 'earth dog', group. Another theory is that the standard long-haired dachshund was developed by breeding smooth dachshunds with various land and water spaniels.