I have 2 Shih Tzus…they are brother and sister. One has straight hair and the other is curly. When I went to the groomer’s I popped the question. And she said Shih Tzus can either have curly or straight hair.
Just curious thanks.
Curly hair is a major genetic fault and it should never be bred. Considering you know that curly hair is in the gene pool, I think the sibling shouldn’t be bred either.