Almost every buyer asks the same question before choosing a working pup: dog or bitch? The barn wisdom is confident and contradictory. “Bitches are sharper but moody.” “Dogs are steadier but lazier.” “Females think, males react.” These claims are repeated so often they feel like settled fact. They are not. When you separate what hormones and reproductive biology genuinely cause from what is simply individual variation dressed up as a sex rule, most of the folklore collapses. Here is what actually holds up.
What the Folklore Gets Wrong
The single most important thing to understand is that the variation within each sex dwarfs the average difference between sexes. If you lined up a hundred working females and a hundred working males and scored them on drive, focus, biddability and stamina, the two bell curves would overlap almost completely. The sharpest dog you ever meet might be male; the steadiest might be female. Picking on sex alone is like picking a runner by shoe size — there is a faint statistical signal, and it is swamped by everything else.
This matters because handlers tend to confirm what they expect. A handler who “knows” bitches are moody will read an off day in a female as proof, and read the identical off day in a male as a one-off. The folklore survives not because it predicts well, but because it is rarely tested against the alternative explanation. Genetics, line, early socialisation and training history explain far more of a dog’s working character than its sex does. The same point runs through our work on the nature-versus-nurture balance in breed-specific traits: instinct expression is shaped by far more than a single variable.
Where Real, Hormone-Driven Differences Exist
Strip away the myths and a few genuine, physiology-based differences remain. They are real, but narrower than the folklore claims.
- Season in intact bitches. This is the one robust, predictable effect. In the weeks around a heat cycle, and especially during a false pregnancy a few weeks after, many intact bitches show reduced focus, lower work tolerance, clinginess or irritability with other dogs. This is hormonal and temporary — not a permanent trait of “females.” Plan trials and heavy training around it, and the issue largely disappears.
- Testosterone and pushiness. Intact males carry more baseline testosterone, which can correlate with more confident pressure on stock, more interest in marking and scenting, and more dog-to-dog challenge. On stubborn cattle this confidence can be an asset; in tight pens around other entire dogs it can be a distraction.
- Body mass and stamina ceiling. Males in most herding breeds are modestly larger and heavier. That can mean a slightly higher top-end power on heavy stock and a slightly higher heat load on hot days — a physiology issue we cover in detail in the heat stress guide. It is a small effect, and a fit, well-conditioned bitch routinely out-works a soft male.
- Maturation timing. Bitches often settle into consistent work a little earlier; some males stay adolescent and silly for longer. The gap is months, not character, and it closes.
Notice what is not on this list: “intelligence,” “trainability,” “biddability” and “natural eye” show no reliable sex difference at all. Those traits track line and individual genetics, not chromosomes.
How Neutering Changes the Picture
Most of the hormone-driven differences above belong to intact dogs. Spaying removes the heat-cycle disruption entirely, which is why many serious trial handlers spay working bitches that are not in a breeding programme — it buys uninterrupted year-round work. Castration lowers testosterone-linked pushiness and marking in males, though it does not touch trained behaviour, drive or instinct, which are not testosterone-dependent. The takeaway is practical: if you remove the reproductive hormones, you remove most of the genuine “sex differences,” and you are left judging the dog on the things that actually matter — its genetics, its training and its individual temperament.
How to Actually Choose a Working Pup
Since sex is a weak predictor, stop leading with it. Lead with the variables that carry real signal:
- Line and parents over sex. Watch the sire and dam work if you possibly can. A litter from two genuine working parents tells you far more than the pup’s sex ever will. Drive, eye and the willingness to take direction run in lines.
- Individual assessment. Within a litter, temperament and boldness vary enormously between same-sex siblings. Assess the actual pup in front of you — its response to pressure, its recovery from a startle, its interest in movement — rather than a category.
- Biddability is genetic, not sexed. The trait that decides whether a dog becomes workable or unworkable is its willingness to accept handler direction while in drive, and that is heritable independent of sex. We unpack the science of this in the genetics of biddability.
- Be honest about management. If you cannot or will not manage heat cycles and do not plan to breed, factor spaying into the decision rather than avoiding bitches on principle. If you keep multiple entire males, factor the dog-to-dog dynamics in honestly.
- Match the dog to the job, not the sex to the myth. Heavy cattle in tough country, a kennel full of other dogs, a one-dog smallholding — these realities should shape your pick far more than a “dogs vs bitches” rule of thumb.
The Honest Bottom Line
Sex is one of the weakest predictors of how a herding dog will turn out. The only consistently real, biology-based difference is the seasonal disruption of intact bitches, and that is manageable and removable. Everything else the folklore insists on — sharpness, steadiness, brains, biddability — is governed by genetics, line and individual variation, not by being a dog or a bitch. Choose the pup whose parents work, whose temperament fits your job, and whose biddability you can read for yourself. For more on how heritable working traits are actually shaped and expressed, browse the full behavioral genetics collection. Pick the dog, not the gender.