 Labradors are medium @-@ large , with males typically weighing 65 to 80 lb ( 29 to 36 kg ) and females 55 to 70 lb ( 25 to 32 kg ) . Labradors weighing close to or over 100 lb ( 45 kg ) are considered obese or having a major fault under American Kennel Club standards , although some Labradors weigh significantly more . The majority of the characteristics of this breed , with the exception of colour , are the result of breeding to produce a working retriever . 
