Male vs Female Dogs: Do Temperament Differences Matter?

By Jessica Ennis, DVM, CVA

Breed Care Guides · August 14, 2026 · 5 min read

If you're choosing a dog based on sex alone, you're optimizing for the wrong variable, the research says training, genetics, and reproductive status carry more weight than whether a puppy is male or female.

A family I counseled last winter had already picked out a name for their next puppy, “Otis,” and had decided on a male because their last dog, a female Labrador, had been “too clingy.” They wanted the opposite this time. I understood the impulse. What I told them, and what I tell most owners who ask this question in the exam room, is that they were about to make a decision based on a variable that explains a small slice of the story. The bigger predictors, breed, individual genetics, socialization window, and whether a dog is intact or altered, were sitting right there in their own history and going unexamined.

What the research actually shows, at a glance:

• Male dogs trend higher on dog-directed aggression, excitability, and attention-seeking behavior in large surveyed samples.
• Female dogs trend higher on trainability and inhibitory control in cognitive testing.
• Neuter/spay status shifts behavior more than sex does on its own, and the direction of that shift is more nuanced than “calmer” across the board.
• Breed and individual temperament explain more variance than sex in almost every behavioral category studied.
• Early neutering is linked to increased shyness and insecurity in some data, a finding that complicates the “fixed dogs behave better” assumption.

What the sex-difference data actually says

The most useful evidence here comes from controlled cognitive and behavioral testing, not folklore. A study on inhibitory control and social cognition, published in Effect of Sex and Reproductive Status on Inhibitory Control and Social Cognition in the Domestic Dog (Canis familiaris): PMC, found that male dogs were more impulsive and independent compared to females, while females showed greater inhibitory control and were more likely to check in with a human during a problem-solving task. Notably, the researchers concluded these differences appeared to arise during early development and weren’t strongly driven by circulating sex hormones at the time of testing, which is a meaningful detail. It suggests the gap is closer to a developmental trait than a hormonal switch you can flip with a single surgery.

Owner-reported behavior surveys point in a similar direction. Males tend to score higher on measures of aggression toward other dogs and on excitability and attention-seeking, while females tend to score modestly higher on trainability. None of these are large effects in absolute terms. A male dog is not destined to be aggressive, and a female dog is not guaranteed to be biddable. These are population-level averages with enormous overlap between the two distributions, which is the part that gets lost when the finding travels from a journal table to a Facebook post.

Why I still won’t tell a client to pick a sex and stop there

I’ve watched this play out enough times to be blunt about it. A retired couple came to me wanting a “calm female” after their neighbor’s male Vizsla wouldn’t settle. What they ended up adopting, on my recommendation, was a female Vizsla littermate from the same breeder, same lines, same high-drive temperament as the neighbor’s dog. She was every bit as busy at five months old. Breed and individual lineage swamped whatever average sex effect existed. I see this pattern most often with owners who are choosing between two puppies from the same litter and picking based on sex when they should be watching how each puppy actually responds to novelty, handling, and frustration in the first eight weeks. That observable behavior, not the pup’s sex, is what predicts the dog you’ll be living with in three years.

The counterargument I hear most is that reproductive status, not just chromosomal sex, is doing the real work, and that’s fair. A study on neuter status and social behavior across weight classes, published in Personality Unleashed: Surveying Correlation of Neuter Status and Social Behaviour in Mixed-Breed Male Dogs across Weight Classes: PMC, found personality and social behavior patterns that tracked with neuter status independent of raw sex. And the AKC’s guidance on spay and neuter timing, laid out in its Should You Spay or Neuter Your Dog? resource, notes that the timing of the surgery interacts with breed, size, and individual risk factors in ways that plain sex differences don’t capture. I still land on sex as a minor input for one reason: even the researchers studying reproductive status can’t fully separate it from sex, breed, and rearing environment in a way that gives owners a clean rule to follow. Treating “male” or “female” as a shortcut skips past the variables you can actually influence.

For breed-specific comparisons where temperament genuinely diverges by design, our guide to Border Collie vs Australian Shepherd covers a case where the breed gap dwarfs any sex effect. The same is true across the Shih Tzu vs Lhasa Apso comparison, where face shape and breed history explain more than sex ever could.

What this means if you’re choosing a puppy

If temperament is your priority, and it should be, I’d rather see an owner spend an afternoon meeting a litter and watching how each puppy handles a new noise or a stranger’s hand than agonize over male versus female. Ask the breeder about the sire and dam’s temperaments specifically. Ask what the household environment has been like for the first weeks. If you already have a dog at home, same-sex pairings can occasionally run into more friction, particularly between two intact females, so factor that into a multi-dog household decision rather than the puppy’s individual prospects alone.

One more thing worth saying plainly: aging changes behavior more than sex does over a dog’s lifetime. The excitable young male mellows. The independent young female often becomes more affectionate. If you’re planning for the next decade with this dog, not just the next year, the more durable questions are about breed, genetics, and how you’ll manage the dog’s environment as it grays, not which sex box it checked at eight weeks old.

Owners weighing energy level and lifestyle fit more broadly may also find our roundup of Best Low-Maintenance Dog Breeds for Busy People useful, since exercise needs and independence trend far more by breed than by sex.