Male vs Female Dogs: Do Temperament Differences Actually Matter?

By Jessica Ennis, DVM, CVA

Breed care · August 9, 2026 · 5 min read

Sex tilts the odds on a few specific traits, but it will never out-vote genetics, socialization, and the home a puppy grows up in.

The Checklist: What Sex Actually Predicts (Before You Read Further)

If you only have a minute, here’s the honest short version. Read the rest for the “why.”

• Male dogs, on average, score higher on measures of aggression toward other dogs, excitability, and attention-seeking.
• Female dogs, on average, score somewhat higher on trainability and stranger-directed friendliness.
• These are population averages, not predictions about your dog. The spread within each sex is much larger than the gap between sexes.
• Spay/neuter status matters as much or more than sex itself, and it changes some of the very traits people attribute to “being male” or “being female.”
• Breed, early socialization, and the home environment outweigh sex in almost every study that has tried to rank these factors.

Now let’s talk about why that checklist looks the way it does, and where I actually land with clients who ask me this question.

The Question I Hear in the Exam Room

I get some version of this question almost every week, usually from a family standing in my exam room with a printout of a litter photo. “Is a male going to be more work?” “Will a female be calmer with the kids?” The honest answer is that sex nudges the odds on a handful of traits, but it is nowhere near the deciding factor people expect it to be. I’d rather spend the appointment talking about the breeder, the mother’s temperament, and the first twelve weeks of the puppy’s life, because those variables move the needle far more than whether the puppy is male or female.

What the Research Actually Shows

The pattern shows up consistently enough across studies that it’s worth naming directly. A behavioral overview hosted on NCBI summarizing dozens of studies on sex and dog behavior found that male dogs tend to express more aggression and more boldness in experimental settings, while female dogs tend to be more sociable, make more physical contact with strangers, and lean more on visual cues in problem-solving tasks. The same overview is candid about its limits: no study has proven a general rule that a dog will behave a certain way simply because of its sex.

Trainability follows a similar pattern in the data, though it’s a softer signal than owners expect. Studies using the widely validated C-BARQ questionnaire — the Canine Behavioral Assessment and Research Questionnaire used across breed clubs and research labs — have repeatedly found that, regardless of breed, male dogs are rated as more aggressive toward other dogs, more excitable, more prone to attention-seeking, and somewhat less trainable than females. A pilot study, Pets: Behavioral Characteristics of French Bulldogs in Italy, used the same C-BARQ framework and found that sex was one of the most consistent predictors in the entire dataset, with females showing lower odds of fear-related and excitability behaviors across seventeen separate behavior items. That’s a meaningfully strong signal — for one breed, in one study. I don’t treat it as gospel for every dog walking into my clinic.

Where Spay/Neuter Status Changes the Picture

Here’s where the conversation usually gets tangled, because owners conflate “male versus female” with “intact versus altered,” and those are not the same question. According to the American Veterinary Medical Association, spaying or neutering removes the hormonal drivers behind mating-related behavior — roaming, marking, mounting, heat-cycle restlessness — without erasing a dog’s core temperament. A playful, affectionate dog stays playful and affectionate after surgery. What changes are the hormone-linked behaviors, not the dog’s personality underneath them.

That distinction matters for this whole conversation, because a fair amount of what people attribute to “maleness” — roaming, marking, mounting other dogs at the park — is really testosterone-driven behavior that neutering substantially reduces. Similarly, some behaviors owners chalk up to “femaleness,” like heat-cycle irritability or attracting unwanted male attention, disappear after spaying. Strip out the reproductive-hormone effects, and the remaining sex-linked gap in trainability and sociability shrinks to something much smaller and much easier to work with through training.

The Case I Keep Coming Back To

A few years ago I worked with a family who had a nine-month-old male Labrador, about 55 pounds, who was mouthy, hard to settle at the door, and starting to lunge at other dogs on leash during evening walks. They were convinced a female would have been the “easy” choice and were half-joking about rehoming him for a calmer girl. What actually turned things around wasn’t a sex swap — it was neutering him at ten months once his growth plates had closed enough for the orthopedic timing to make sense, paired with six weeks of structured leash work and a consistent settle-on-a-mat routine at the door. By month three post-surgery, the door greetings were manageable and the leash reactivity had dropped from nearly every walk to maybe once every couple of weeks. The dog didn’t change species or sex. His hormones changed, and so did his training plan, and that combination did the actual work.

What Actually Drives Temperament (Sex Included)

If I had to rank the factors that predict how a grown dog behaves, sex would sit well below breed, below the mother’s temperament and the breeder’s rearing practices, and below the owner’s consistency in the first year. This is exactly why breed-specific comparisons tend to be more useful than sex-based ones when you’re choosing a puppy — see how differently the calculus plays out in a piece like Border Collie vs Australian Shepherd, where drive and job history explain far more of the day-to-day behavior than sex ever could. The same holds in flat-faced breeds; a comparison like French Bulldog vs Boston Terrier hinges on structural and health differences long before sex enters the conversation. And when families ask me about coat and shedding instead of temperament, I point them to Labradoodle vs Goldendoodle: Which Doodle Fits You, because generation labels tend to matter more than sex there too.

Socialization windows matter enormously as well. A puppy of either sex who gets varied, positive exposure to people, dogs, surfaces, and sounds between eight and sixteen weeks is going to out-perform a poorly socialized puppy of the “easier” sex almost every time.

My Bottom Line for Owners Choosing Between a Male and a Female Puppy

Choose the individual puppy, not the sex. If you’re standing between two littermates and everything else — health testing, parent temperaments, your household’s routine — is equal, then yes, lean on what the data shows: a female puppy carries slightly better odds of being easier to train and more instantly friendly with strangers, and a male puppy carries slightly higher odds of dog-directed pushiness that neutering and training will mostly resolve. That’s a real but modest edge, not a guarantee.

I’ll say the part some breeders won’t: I’ve placed plenty of “typical” males who ended up calmer than their sisters, and plenty of females who needed far more structured training than expected. If your household has young kids or an anxious resident dog, I’d weigh the individual puppy’s early behavior and the breeder’s transparency about the litter more heavily than sex. Sex is a tiebreaker, not the deciding vote.