Why Do Cats Make Biscuits? Most of the Reasons Are Untested

A nursing kitten pumps its front paws against its mother’s belly mostly when the milk is coming more slowly than it can drink, according to Bonnie Beaver’s veterinary textbook Feline Behavior. An adult cat kneading a lap is making the same motion with no milk to hurry.

Why do cats make biscuits?

Cats make biscuits because kneading begins as a feeding instinct. Nursing kittens push their front paws against the mother’s mammary glands to stimulate milk flow, and pet cats can keep the habit as adults, when it usually signals a relaxed, contented cat. The scent-marking and nest-making reasons repeated on pet-care sites remain untested.

A veterinary textbook calls it the milk tread

In Beaver’s chapter on feeding, the milk tread “consists of rhythmic alternate movements of the forepaws against the mammary gland.” It may first help push the mother’s skin away from a newborn’s nose, then “soon becomes more important to help stimulate milk flow,” usually alternating with nonrhythmic sucking.

Scientific American put the question to several specialists in 2023. Leticia Fanucchi, an animal behaviour scientist at Oklahoma State University, said kneading is instinctual and never has to be learned.

The nickname comes from the look. Each stroke includes a grasping motion of the claws “as if the cat were kneading dough,” according to Wikipedia’s article on kneading. Flies get the same treatment: an insect that seems to be rubbing its hands together is cleaning the taste sensors on its feet.

Feral cats tend to stop kneading

Lauren Finka, a cat behaviour expert at Cats Protection, told BBC Science Focus that free-living cats not socialised to people mostly drop kneading along with other kitten behaviours. Such cats “don’t tend to perform these behaviours when they leave the nest,” she said.

It is “not unusual for domesticated animals to retain juvenile traits into adulthood,” Scientific American notes. The pattern is called neoteny, and the magazine says it also explains why dogs look and act more like wolf cubs than adult wolves.

The same article describes a kneading cat as “often purring as it does so,” and Beaver’s chapter records that purring by both mother and kittens often accompanies nursing. Wikipedia suggests the pairing “may indicate the origin of kneading as a remnant instinct.”

Kneading, meowing and purring are “all things that humans unknowingly encourage cats to maintain in their repertoire,” Lauren Finka of Cats Protection told BBC Science Focus.

Scent marking and nest-making are still hypotheses

Beyond nursing, the standard list offers contentment, scent marking, nest-making by wild ancestors and stretching. “Some of these are just theories because we don’t know,” said Susan Nelson, a veterinarian at Kansas State University. “Cats don’t get the funding for studies like dogs do.”

Finka said kneading “hasn’t been researched in-depth scientifically.” Other famous cat behaviours have the same gap: the leap away from a cucumber has no published study behind it either. The pull of boxes is one of the few exceptions: in two Dutch shelter trials, newly arrived cats given a hiding box settled days sooner than cats without one.

Scent marking has real anatomy behind it. Hilary Feldman’s 1994 Cambridge study of semi-feral cats lists scent organs on the cheeks, abdomen and paws, and describes cats leaving odour from paw glands while scratching. The four kinds of marking it examined were urine spraying, elimination, scratching and rubbing. Kneading was not one of them.

Fanucchi told Scientific American that kneading activates the paw glands, and Finka suggests “it may be that they knead us to deposit their scent.” Neither article cites a study that measured it.

Nest-making has less. The idea that wild ancestors trod down grass to make a temporary nest appears in Wikipedia’s article with no source of its own. No published test of it turns up either: a PubMed search for kneading in cats returns nine papers, none of them on nesting.

Stretching has the same problem. Wikipedia says “some experts” think kneading makes a cat feel good the way stretching does, without naming them, and tags the claim “citation needed.” Fanucchi’s remark that kneading stretches the muscles describes an effect of the movement rather than a tested motive.

A lap can stand in for a mother

Kristyn Vitale, a certified applied animal behaviorist then at Unity Environmental University, told Scientific American: “It’s possible that some of these juvenile behaviors we see that used to be directed at the mother are now directed at the owner.” She added that kneading on a favourite person “can also be that affiliative, social behavior that can help build a bond,” and that it usually means a cat feels happy, friendly and safe.

A 2021 guide to feline emotions in the Irish Veterinary Journal reads it the same way, listing “kneading/treading paws” among the actions of a contented cat, alongside stretching, yawning and grooming.

In a 2019 Oregon State University study Vitale led, cats spent two minutes in a new room with their caregiver, two alone and two reunited. Of 70 kittens that could be classified, 64.3 percent were securely attached, as were 65.8 percent of 38 adult cats. The university puts human infants at 65 percent.

The test measured attachment rather than kneading, so it cannot say what a kneading cat means. It does show most cats using a person as a source of comfort, and Vitale suggests that attachment to humans “may represent an adaptation of the offspring-caretaker bond.”

The weaning evidence is about other behaviours

Another claim gets attached to cats that knead a lot: that they were taken from their mothers too young. Wikipedia’s version has no reference and carries a “citation needed” flag.

A University of Helsinki team collected questionnaire data on 5,726 cats from 40 breeds and reported in 2017 that cats weaned before 8 weeks were more likely to behave aggressively toward strangers than cats weaned at 12 to 13 weeks. The paper mentions wool sucking, which “is thought to arise from the motivation to suckle.” It never mentions kneading.

Claim	What supports it	Status
Nursing holdover	The milk tread in a veterinary textbook; adult pets can keep it	Documented in kittens; best-supported for adults
Contentment	Listed under contentment in a 2021 veterinary emotion guide	Expert reading
Scent marking	Paw glands exist; the marking evidence is from scratching	Untested in kneading
Nest-making by wild ancestors	Stated without a source	Untested
Stretching	One expert says it stretches the muscles; the motive is unsourced	Untested as a reason
Weaned too early	A weaning study that did not measure it	Unsupported

The name comes from bread, but the movement was built for milk. The scent and nest stories rest on less: a set of paw glands and a guess about grass. Strictly FYI.