Let's sort this out from the standpoint of scientific research: can a dog really be afraid of a cat — even if it is several times bigger?
Funny clips where a huge dog cautiously backs away from a tiny cat look almost illogical. Before us is an animal ten times larger, stronger, and physically clearly more capable of standing up for itself — yet sometimes a single feline look is enough for the dog to decide: better to step away.
In reality, size is far from the main factor here.
Studies of the behavior of dogs and cats show that relations between these species are built primarily on experience, familiarity, the ability to read each other's signals, and previous encounters.
And a cat really does have a good set of means of persuasion.
Hissing, an arched back, sudden movements, flattened or turned-back ears, a fixed stare, and a quick swat of the paw — all of these are very clear signals: "don't come near".
Moreover, the swat of the paw usually lands on the muzzle — one of the most sensitive parts of a dog's body.
That is why a large dog is by no means obliged to think: "I'm bigger — therefore I'm stronger." Its nervous system decides far more pragmatically:
"The last time I came close, I got it on the nose. Why repeat it?"
There is another interesting reason as well: dogs and cats initially speak somewhat different "body languages."
Some signals can mean different things in the two species. But if the animals live together long enough, they gradually learn to understand each other. This happens especially well if the dog and cat met at a young age.
Most domestic dogs and cats are generally capable of living quite peacefully. Many play with each other, sleep side by side, and calmly share space.
So the popular idea of an eternal war between cats and dogs is greatly exaggerated.
But the character of the relationship is always individual.
Some dogs get excited at the sight of a cat and want to approach. Others bark. Some perceive it as an object of pursuit. And there are dogs that, after a few unpleasant encounters, choose the safest option — avoidance.
That is exactly what we most often see in funny videos.
The dog presses itself against the wall, turns its head away, slowly backs off, hides behind its owner, or tries to walk past the cat in the widest possible arc.
From the outside it looks like a comedy, but from the standpoint of the animal's behavior it is a perfectly reasonable strategy for reducing conflict.
And sometimes the cat does not have to do anything at all.
If the animals have lived together for a long time, their own history of relations has already taken shape between them. The dog knows perfectly well where the cat's boundary lies and what will happen if it is crossed.
Hence the famous scene:
a huge dog stands in the hallway, and a cat sits in the passage.
Physically, the dog can get through.
Psychologically — it cannot.
And this is perhaps the most interesting part: animals assess each other not only by size. They take into account temperament, past experience, the opponent's confidence, and the consequences of previous encounters.
That is why a cat weighing three kilograms really is sometimes capable of controlling a dog weighing forty.
Not because the dog has forgotten how big it is.
But because it remembers very well how convincing the cat is.

