English: Clydesdale horse, Walkershill Clydesdales are a native breed of heavy horse originating in Lanarkshire. In the days before mechanization they were literally the workhorse of Scottish agriculture, but during the period between the wars as the tractor became more common their numbers declined, reaching a low in the 1970's, when there seemed to be a real risk of the breed dying out. Happily since then, thanks to a handful of enthusiastic breeders, its numbers have increased again.