Dried liver slices - I get turkey livers as my pup is raw fed and she has liver with her vegetables and supplements once a week - but you can use any liver. Slice it very finely, lay the slices on a sheet of greaseproof paper [or brown paper] and slowly dry in either a microwave oven on its lowest number, or in an oven, also on a very low heat.
You can then break the dried slices into whatever size you want.
Is there any reason why you think that people do not do so?
Anyhow, why not join the Forum and introduce your self in the New Members Introduction section?
There are many other sections, including the section Dachshund Training and Obedience, which might interest you.
Tikki