Prospective owners ask about male vs female Labs constantly, and most guides oversell the differences. The honest answer: individual variation within each sex is bigger than the average difference between them. What actually matters is the specific puppy in front of you and the household they’re going into — sex is a minor input, not the deciding factor. My Labrador Retriever 101 guide covers the wider picture if you’re still deciding on the breed itself.
That said, there are genuine patterns worth knowing.
Size
Males run consistently larger, though there’s real overlap between the sexes. Per the AKC breed standard:
| Height | Weight | |
|---|---|---|
| Male | 57–62cm at the shoulder | 29–36kg |
| Female | 55–60cm at the shoulder | 25–32kg |
A large female and a small male can land in roughly the same place, so if size genuinely matters for your household — handling, living space, small kids — the individual puppy’s parents tell you more than sex alone does.
Temperament: real patterns, oversold differences
The usual claims — females calmer and easier, males more affectionate and food-driven — have some truth in them, but far less than the generalisation suggests.
Males tend to run slightly more exuberant and boisterous, particularly through adolescence, and are often described as more openly, insistently affectionate. The 6–18 month stretch can be genuinely harder in males — the testosterone surge makes them more distractible and more inclined to test boundaries — and they’re generally a touch slower to mature emotionally than females. Intact males also mark territory and react strongly to females in season, which can meaningfully affect recall and general behaviour.
Females tend to be described as more independent and less constantly attention-seeking, and often mature a little earlier, which can make the adolescent phase feel shorter in practice. Unspayed females cycle roughly every six months, which brings bleeding, hormonal shifts, sometimes phantom pregnancies, and occasionally increased clinginess or moodiness around a season — all things to plan around rather than problems in themselves. Spaying removes the season-related behaviour but introduces its own hormonal changes, and most vets now recommend waiting until after the first season before doing it.
Neutering matters more than sex does
Whether a dog is neutered at all tends to shift temperament more than sex does on its own. A castrated male loses most of the testosterone-driven behaviour — marking, interest in females, some inter-male tension. Timing matters too: growing veterinary evidence links early neutering (before 12 months) in large breeds to higher rates of joint problems and certain cancers, and current guidance generally favours waiting until physical maturity rather than defaulting to the traditional 6-month timeline.
If you already have a dog
Opposite-sex pairings generally settle more smoothly than same-sex ones. Two intact males together can be genuinely difficult, and — somewhat counterintuitively — serious female-on-female aggression tends to be both more common and more persistent than male-on-male tension when it does happen. These are tendencies rather than guarantees, but worth weighing if you’re adding a second dog.
I’ve met plenty of calm, easy-going males and plenty of high-maintenance females, and the reverse just as often. A breeder who’s watched a litter for eight weeks has a far better read on individual puppy temperament than sex alone will ever give you — tell them what you’re after (calmer, more driven, more biddable) and let them match you to the actual puppy rather than picking blind by sex.
A few things worth clearing up while we’re at it: the training-difficulty gap between sexes is real but small — females sometimes have a slight edge during adolescence thanks to earlier maturity, but males generally close that gap once they’re through it, and it’s rarely a good reason to choose one over the other. The idea that males bond more strongly to one person isn’t well supported either — Labs as a breed tend to be affectionate across the whole household rather than fixating on one person, and where that does happen it usually reflects the household’s dynamics more than the dog’s sex. On health, spayed females lose the risk of pyometra and see reduced mammary tumour risk if spayed before the first or second season, while castrated males lose testicular cancer risk entirely — beyond that, both sexes carry the same breed-wide risks around hips, elbows, and eye conditions, and overall outcomes with good veterinary care are broadly similar either way.
Another comparison worth reading if you’re still deciding on the breed: Golden Retriever vs Labrador. And once sex is settled, my full Labrador size chart covers adult height and weight in more depth than the table above.