Trait Genetics

Coat Length and Furnishings Genetics in Herding Breeds: FGF5, RSPO2 and the Rough/Smooth Question

June 6, 2026

Three genes — FGF5, RSPO2 and KRT71 — explain rough vs smooth Collies and Border Collie coat variation, and let you predict coat type in a litter before the puppies are born.

The Natural Bobtail Gene (TBXT) in Herding Breeds: Genetics, Lethality, and Breeding Ethics

June 4, 2026

The C189G mutation in TBXT gives herding dogs their natural bobtail — but it's semi-lethal. Here's the real genetics, the breeding rule it forces, and the welfare debate.