THE achondroplasia-like condition which gives rise to the ‘bull-dog’ calf is not uncommon in certain breeds of cattle, notably in the Dexter, in which it has been shown to have a definite genetic basis and to be due, possibly, to a retardation in the functioning of the pituitary during fotal life (Crew1). In the Norwegian Telemark breed, Wriedt2 has described a very similar condition which, however, is different genetically. It has also been reported in the case of the sheep (Crew and Roberts3).