The invention provides a method of predicting the size of a dog that will be attained in adulthood, comprising typing the nucleotide(s) present for a single nucleotide polymorphic (SNP) marker present in the genome of the dog at a position equivalent to position 201 in one or more of the sequences identified in Table 1, and/or at one or more positions which are in linkage disequilibrium with any one of these positions, and thereby predicting the size of the dog that will be attained in adulthood.
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