Not Just in Personalities: Cat Breeds Differ in Behavioral Variability Too

Most people who have lived with a cat know that no two felines are exactly alike. One might be a fearless acrobat who greets every visitor with a purr, while another is a shy shadow that hides under the sofa at the sound of a doorbell. For years, scientists have studied these individual differences, known as personality, and have also looked at how different breeds tend to behave on average. We know that some breeds, like the Siamese, are often described as more vocal or social, while others might be more reserved. This understanding of the "average" cat has helped owners and veterinarians set expectations. However, a deeper question has remained largely unexplored: do some breeds vary more wildly in their personalities than others? It is possible for two breeds to have the same average level of friendliness, yet for one breed to be a tightly knit group of similar cats, while the other contains a chaotic mix of the friendliest and the most aloof individuals imaginable. Understanding this spread of behavior is crucial because it tells us whether a breed label can truly predict how a specific cat will act, or if the label only gives a rough sketch of the middle ground.

A new analysis of thousands of cats suggests that the answer is yes: breeds do differ in how much their personalities vary. Researchers re-examined data from two massive surveys conducted in Finland, involving a total of over 10,000 cats. In the first study, which included more than 4,300 cats, owners answered detailed questions about their pets' behavior. The researchers looked at five key personality traits: how fearful a cat is, how aggressive it is toward people, how playful it is, how friendly it is toward other cats, and how friendly it is toward humans. They wanted to see if the "spread" of scores for these traits was different depending on the breed. To ensure their findings were real and not just a result of the math, they had to be very careful. Cat personality scores often cluster at the low or high ends of a scale, which can make the data look more scattered than it really is. The team used a statistical method to smooth out these uneven shapes, effectively leveling the playing field so they could see the true differences in variation.

After this careful adjustment, the researchers found that four of the five personality traits showed clear differences in how much cats within a breed varied from one another. For aggression toward humans, fearfulness, and friendliness toward both cats and people, some breeds showed a wide range of behaviors, while others were much more consistent. For example, in the trait of fearfulness, the variation in one breed was nearly twice as large as the variation in another. However, the trait of playfulness did not show this same pattern; the amount of variation in how playful cats were seemed to be the same across all breeds. The effect was real but modest. The researchers calculated that the breed group itself explained only a small fraction of the differences in how much cats varied. This means that while knowing a cat's breed tells you something about how much personality diversity to expect within that group, it does not allow you to predict the personality of any single cat with certainty.

To be absolutely sure these results were not a fluke of the first survey, the team tested their ideas against a second, completely separate dataset containing information on more than 5,700 cats. This second study used a different questionnaire and different ways of measuring personality, focusing on aggression, shyness, and a mix of activity and social contact. The results held up. The researchers found that breeds again differed significantly in how much they varied in aggression and shyness. Just like in the first study, the specific ranking of which breed was the most or least variable did not match perfectly between the two groups, but the overall pattern was the same: some breeds are more diverse in their personalities than others. This consistency across two different groups of cats and two different ways of asking questions gives the findings strong weight.

The study also looked closely at whether these differences were caused by the way the data was collected or by the specific questions asked. They rebuilt the personality scores from the original questions in several different ways and tested if the results changed. The core finding remained stable: breeds do differ in their behavioral variability. However, the researchers were careful to note that this does not mean a breed is "genetically programmed" to be unpredictable. The differences in variation could be influenced by many factors, including how breeders select cats, the environments the cats live in, or even how owners perceive and report their pets' behavior. The study explicitly ruled out the idea that these findings prove that some breeds are inherently more uniform or chaotic than others due to artificial selection alone. Instead, the results suggest that the amount of personality diversity is a characteristic of the breed group, but one that is influenced by many real-world factors.

Ultimately, this research adds a new layer of nuance to our understanding of cat breeds. It confirms that while we can talk about the average personality of a breed, that average does not tell the whole story. A breed might have a reputation for being friendly, but within that group, there could be a wide spectrum of social behaviors, from the most outgoing to the most distant. For cat owners and veterinarians, the takeaway is clear: a breed label is a starting point, not a crystal ball. It can hint at the general tendencies of a group, but it cannot predict the specific personality of an individual cat. The most reliable way to understand a cat remains observing its own unique history and behavior, rather than relying solely on the name of its breed.