A method for predicting risk of joint dysplasia, osteoarthritis and/or a condition that is secondary to joint dysplasia in a mammalian subject of the order Carnivora, the method comprising: (a) determining the genotype of said subject in respect of one or more genetic polymorphisms and/or alterations, such as polymorphisms in the CHST3 gene; and (b) providing a prediction of said risk based on said genotype. Products for use in such a method and related methods of determining propensity of a subject to respond to therapy and of selective breeding, are also disclosed.
