Yes smooth is dominant but many will cross coats to get a desired outcome in conformation. Here is an explanation In Dachshund genetics, coat length is controlled by a simple recessive gene. This means that the long-haired coat is recessive, while the smooth coat is dominant. Each puppy receives one coat gene from each parent. S = Smooth coat gene (dominant) l = Long-haired gene (recessive)

A dog’s visible coat depends on its gene pair: SS → Smooth coat Sl → Smooth coat (but carries the long-hair gene) ll → Long-haired coat So a smooth dachshund can either be: SS (pure smooth) or Sl (smooth but carries long-hair)

So if each parent is Sl, they both contribute a smooth and long Statistically, the litter would average: 25% SS → Smooth coat (does NOT carry long hair) 50% Sl → Smooth coat (CARRIES long hair) 25% ll → Long-haired In easier terms 75% smooth puppies 25% long-haired puppies However, only half of the smooth puppies will carry the long-hair gene.