Dog lovers-is it normal for my little pup's tummy to be this hairless?

E.L.B.➰ • 27. Engaged 💍 to the LOML. Not TTC, enjoying being child-free!
I've never seen another dog with such a naked tummy and I want to make sure she doesn't have a vitamin deficiency or something. She's been to the vet and the vet never commented on it. Should I be worried?
She's a dachshund/minpin mix.