Summary: Short-nosed, or brachycephalic, dog breeds such as Pugs and French Bulldogs are often viewed as calm, affectionate companions. However, a new study of more than 5,000 purebred dogs shows that head shape is only part of the story. Small body size, limited training, and owner practices — especially pampering by inexperienced owners — contribute substantially to many of the behavioral problems attributed to these breeds.
Although flat-faced breeds do show some intrinsic traits like calmness and boldness, these positive tendencies can be masked or reversed by environmental and management factors: being allowed on furniture, living primarily indoors, and receiving inconsistent or minimal training all shape how these dogs behave day to day.
Key Facts
- Behavioral traits: Calmness and boldness are linked to brachycephalic head shape, but poor recall and low trainability are primarily associated with small size and undertraining rather than skull shape alone.
- Owner influence: Short-nosed breeds are more often kept by first-time, young, single owners—commonly women—who may unintentionally reinforce unwanted behaviors through excessive pampering and by prioritizing companionship over training.
- Training matters: Even breeds with genetically calmer temperaments need consistent training and management to express desirable behaviors in real life.
Source: ELTE
Short-nosed dog breeds, like French Bulldogs and Pugs, remain immensely popular. But are they truly better companion animals than other breeds?
Researchers at Eötvös Loránd University (ELTE) conducted a large-scale owner survey to untangle how head shape, body size, keeping conditions, and owner characteristics combine to influence behavior. Their analysis included more than 5,600 dogs across 90 breeds and examined four personality traits and four behavioral problems, while controlling for 20 demographic and dog-keeping variables.
Short-nosed breeds rank high in popularity worldwide despite well-documented health challenges such as breathing difficulties, skin and eye problems, and allergies. The appeal has long been associated with their juvenile facial features, but behavior appears to be another important factor: many owners describe these dogs as sociable, attentive, and playful, and earlier work has shown they often make more eye contact and respond well to human gestures.
When researchers initially compared head shapes alone, brachycephalic dogs scored higher on calmness and boldness, but also showed some less favorable patterns: they were reported as harder to train, had poorer recall, and reacted more strongly when guests arrived. However, deeper analysis revealed that these patterns were entangled with other traits common to short-nosed breeds.
The typical short-nosed dog in the dataset was small, young, often unneutered, rarely professionally trained, kept primarily indoors, and frequently allowed on beds and furniture. Their owners were disproportionately young, inexperienced dog owners who lived alone and sought a companion animal. Each of these factors—owner experience, dog age, size, and daily management—independently affects behavior and can conceal or mimic effects that might otherwise be attributed to head shape.
Using multivariate statistical models, the team showed that many behavioral differences vanish once body size and management are taken into account. For example, low trainability in brachycephalic breeds was largely explained by their small size and lower levels of training; when those factors were controlled, trainability did not differ significantly across head shapes, according to Borbála Turcsán of the MTA-ELTE ‘Momentum’ Companion Animal Research Group.
Still, some behaviors were directly associated with skull shape. Short-nosed dogs appeared less sociable toward other dogs, although this effect was partly offset because many of the individuals were young and youth is linked to higher sociability. On the positive side, once undertraining, small size, and pampering were accounted for, short-faced dogs were actually genetically less inclined to jump up on people, pull strongly on the leash, or overreact to visitors.
ELTE’s Enikő Kubinyi explains that anatomical differences could underlie behavioral variation: the brains of brachycephalic breeds are more rounded and their neural activity patterns differ from those of long-nosed breeds, which may influence behavioral regulation. Additionally, health issues such as breathing difficulties or musculoskeletal pain can reduce activity and be perceived by owners as calmness, further complicating interpretation.
The principal takeaway is practical: short-nosed breeds do possess certain innate advantages—chiefly calmness and lower reactivity—but these strengths are often obscured by small body size, inconsistent or absent training, and permissive management. To bring out the best in these popular companion animals, consistent training and appropriate management are essential; pampering alone will not allow their good traits to shine.
About this animal behavior and psychology research news
Author: Sara Bohm
Source: ELTE
Contact: Sara Bohm – ELTE
Image: The image is credited to Neuroscience News
Original Research: Open access.
“Selection for Short-Nose and Small Size Creates a Behavioural Trade-Off in Dogs” by Borbála Turcsán et al. Animal
Abstract
Selection for Short-Nose and Small Size Creates a Behavioural Trade-Off in Dogs
Brachycephalic head shape in dogs has been associated with behavioral traits that enhance their appeal as companion animals, which may help explain their popularity. Yet it has been unclear whether these behavioral differences arise directly from head shape or are mediated by factors including body size, owner demographics, and dog-keeping practices.
Using two large owner surveys (N = 5,613) and cephalic index estimates for 90 breeds, this study examined relationships between head shape and eight behavioral variables (four personality traits and four behavioral problems) while controlling for 20 demographic and dog-keeping characteristics and body size.
The results demonstrate that behavioral differences between head-shape groups are only partly attributable to skull morphology; many apparent effects are explained by confounding variables. Specifically, brachycephalic dogs often appear predisposed to positive behaviors such as calmness and fewer behavioral problems, but these advantages are frequently obscured by small body size and limited training experience.
These findings underline the complex interplay among morphology, behavior, and environment, and emphasize the importance of training and management in promoting the behavioral well-being of popular short-nosed breeds.