Male vs Female Dogs: Do Temperament Differences Matter

By Jessica Ennis, DVM, CVA

✓ Medically reviewed by Jessica Ennis, DVM, CVA — August 6, 2026 For general education — not a substitute for veterinary care.

Breed care · August 16, 2026 · 5 min read

Sex predicts almost nothing about the dog sleeping at the foot of your bed in three years — training, breed, and the first six months predict almost everything.

The fork most people hit at the shelter or the breeder’s is some version of this: “boys are more affectionate, girls are calmer and easier to train.” It’s a tidy story. It’s also only partly true, and the part that’s true matters less than people think.

Here’s a checklist to work through before you let sex decide anything:

• Ask what the research actually measured — boldness, impulsivity, and sociability differ slightly by sex on average, but the overlap between individual males and females is enormous.
• Weigh breed over sex — a female Border Collie and a male Border Collie have more in common with each other than either has with a laid-back male Cavalier.
• Factor in reproductive status separately from sex — intact males roam and mark more; that’s hormones, not “maleness” as a personality.
• Rule out littermate and rearing effects — early socialization window (roughly 3–14 weeks) shapes temperament more than chromosomes do.
• Decide what you’re actually optimizing for — trainability, independence, dog-dog sociability, or resilience to a chaotic household.

What the data actually says

I want to be honest about the size of this effect, because clients walk into my exam room having already decided a girl will be “easier.” A 2019 overview in Behavioral and Perceptual Differences between Sexes in Dogs: An Overview: Behavioral and Perceptual Differences between Sexes in Dogs found that males tend to score higher on boldness and assertiveness, particularly in unfamiliar or competitive contexts, while females show somewhat greater intraspecific sociability — they cooperate more readily with other dogs on shared tasks. Females were also more inclined toward interspecific social engagement with people in cooperative problem-solving, while males leaned more toward social play.

That’s a real pattern. It’s also a population-level average, not a rule you can apply to the specific puppy in front of you.

A separate study on inhibitory control, Effect of Sex and Reproductive Status on Inhibitory Control and Social Cognition in the Domestic Dog (Canis familiaris): Effect of Sex and Reproductive Status on Inhibitory Control and Social Cognition in the Domestic Dog, found males were more impulsive and independent, while females showed greater inhibitory control and looked to humans more often during problem-solving. What stood out to me: neutering status didn’t change these results much, which suggests the differences show up early in development rather than being driven primarily by circulating sex hormones in adulthood.

The scene that changes how I counsel this

I had a family in a few years back who’d already picked a name — for a girl. They’d read that female Labs were “calmer” and wanted a low-key dog for their two kids, ages six and nine, in a small ranch house with a fenced quarter-acre. What they got instead, three weeks later, was a male littermate the breeder had left after the “reserved” female pups were spoken for. Eight weeks old, eleven pounds. The mom called me convinced they’d made a mistake.

We talked through what she was actually noticing: he chewed the corner of the ottoman, he barked at the vacuum, he wouldn’t settle during dinner. None of that is a sex trait — that’s an eight-week-old puppy with zero training history. By month four, after consistent crate routine and a beginner obedience class, he was calmer at dinner than most female puppies I see at that age. The “girl dog” story she’d been sold had nothing to do with the dog she actually had.

Where breed and neutering do the real work

If you’re choosing between two puppies of the same breed and litter, sex is a minor variable next to individual temperament, which you can partly assess through early behavior — how a puppy responds to handling, noise, and novelty at 7–8 weeks tells you more than its sex chromosomes will.

Reproductive status is where sex-linked behavior actually shows up most clearly in clinical practice. Per American Veterinary Medical Association guidance, spaying or neutering removes the source of sex hormones driving mating-related behavior — roaming and marking in intact males, heat-cycle restlessness in intact females — while leaving the dog’s underlying temperament largely intact. That’s a distinction I make constantly: don’t confuse “intact male behavior” with “male behavior.” They’re not the same thing, and conflating them leads owners to pick a sex when what they actually need is a spay or neuter conversation.

The American Kennel Club makes a similar point in Are We Gender-Stereotyping Our Dogs?, noting that the biggest influence on a dog’s personality and fit with a family isn’t sex — it’s how the dog is trained and what it’s exposed to during development. I’d add breed to that list before sex, every time.

For breed-specific decisions where temperament genuinely diverges, this matters more than sex ever will. If you’re deciding between two working breeds, our Border Collie vs Australian Shepherd comparison walks through how herding style and drive differ — differences that dwarf anything sex predicts within either breed. Same logic applies if you’re weighing Labrador vs Golden Retriever: pick the breed profile first.

A short story about getting it backward

One of the more memorable consults I’ve had was a retired couple who wanted a second dog, specifically a male, because their first dog — a female terrier mix — had “used up all the sass in the house” and they wanted something mellow. The male puppy they brought home, a ten-week-old terrier mix himself, turned out to be twice as reactive to the doorbell as their first dog ever was. It took eight weeks of desensitization work before he could hear the bell without launching off the couch. Sex told them nothing useful going in. What would have told them something: meeting the puppy’s parents, asking about the litter’s noise reactivity, and watching how he handled a dropped pan during the home visit.

What actually predicts temperament

If you’re choosing a dog and want the variable that carries real weight, prioritize in this order: breed and line temperament, individual behavioral assessment as a puppy or in a shelter evaluation, the home’s training commitment in the first six months, and reproductive status. Sex sits near the bottom of that list — present, measurable in aggregate research, but small next to everything else on it.

If your household has multiple dogs already, dog-dog sociability differences (females cooperating more readily on shared tasks, per the research above) can matter more for pack harmony than it does for one dog living solo with people. And if allergies or coat management are part of your decision matrix too, our guide on hypoallergenic dog breeds covers a separate axis worth weighing alongside this one.

Bottom line: the research shows small, real average differences in boldness, impulsivity, and sociability between male and female dogs — but breed, individual temperament, and training explain far more of the dog you end up living with than sex does. Don’t let “boy” or “girl” make the decision a breeder interview and a few honest hours with the puppy should be making instead.