 A colouration known as " Dudley " is also possible . Dudleys are variously defined as yellow Labradors which have unpigmented ( pink ) noses ( <unk> ) , yellow with liver / chocolate pigmentation ( AKC ) , or " flesh coloured " in addition to having the same colour around the rims of the eye , rather than having black or dark brown pigmentation . A yellow Labrador with brown or chocolate pigmentation , for example , a brown or chocolate nose , is not necessarily a Dudley , though according to the AKC 's current standard it would be if it has chocolate rims around the eyes ( or more accurately of the genotype <unk> ) . Breed standards for Labradors considers a true Dudley to be a disqualifying feature in a conformation show Lab , such as one with a thoroughly pink nose or one lacking in any pigment along with flesh coloured rims around the eyes . True Dudleys are extremely rare . Breeding in order to correct pigmentation often lacks dependability . Because colour is determined by many genes , some of which are recessive , crossbreeding a pigmentation non @-@ standard yellow Labrador to a black Labrador may not correct the matter or prevent future generations carrying the same recessive genes . For similar reasons , crossbreeding chocolate to yellow Labradors is also often avoided . 
