Your dachshund is now a senior citizen.
It would be a good idea if your vet performed a senior blood profile that includes a thyroid test, and urinalysis, if it has not been done recently. A tick profile analysis would also be warranted, as would abdominal X-Rays.
Anemia can cause Pica, which is the licking (and eating) of non-food items, and, anemia can be caused by tick diseases, tumors, and other infectious and non-infectious causes.
I recently had a patient whose only symptoms were licking bricks, and a cast iron stove, and vomiting occasionally. She was anemic and I discovered a splenic tumor when I performed X-Rays. She did very well after surgery and it turned out to be a benign tumor.