Cats lick plastic because it often smells and tastes like food to them, and the texture provides a satisfying sensory experience. Plastic bags in particular contain trace amounts of animal fat used during manufacturing, which cats can detect with their highly sensitive noses. While occasional licking is usually harmless, persistent plastic licking can signal a behavioral or medical issue worth paying attention to.
Plastic Bags Contain Animal-Derived Fats
The most common explanation is surprisingly simple: many plastic bags literally contain animal fat. During manufacturing, salts of stearic acid, a fatty acid derived from rendered beef fat (tallow), are added to raw polyethylene as “slip agents” at concentrations of 100 to 200 parts per million. These additives help the plastic slide smoothly through machinery and give bags that slippery feel. While the amount is tiny, a cat’s sense of smell is roughly 14 times stronger than yours, so they can pick up on traces of animal fat you’d never notice.
Biodegradable and eco-friendly bags add another layer of attraction. Many are made with cornstarch-based polymers, which carry a faint scent and flavor that appeals to cats. If your cat seems especially drawn to grocery bags or compostable packaging, this is likely why.
The Texture and Sound Matter Too
Beyond the smell, plastic offers cats a unique sensory experience. Veterinary behaviorists describe plastic licking as a “texture-specific eating disorder,” meaning some cats are simply drawn to the smooth, cool feel of plastic on their tongue. The crinkling sound a bag makes when a cat paws at it or mouths it can also trigger predatory instincts, mimicking the rustling of small prey in leaves or grass. For a bored indoor cat, a plastic bag on the kitchen counter is a surprisingly rich source of stimulation.
When Plastic Licking Points to Pica
If your cat doesn’t just lick plastic but actively chews and swallows it, the behavior may cross into pica, a condition where animals eat non-food items. Pica in cats has several possible triggers. Some are behavioral: cats weaned too early may redirect suckling behavior toward plastic or fabric. Cats with separation anxiety or insufficient mental stimulation sometimes develop repetitive behaviors that resemble obsessive-compulsive disorder. Researchers at Cornell’s College of Veterinary Medicine have investigated whether fabric and non-food eating in cats may be a form of feline OCD, similar to the condition in humans.
Medical causes are also well documented. Two studies found a high prevalence of pica in cats diagnosed with a type of anemia called immune-mediated hemolytic anemia. Gastrointestinal problems, including inflammatory bowel disease, stomach motility disorders, and intestinal parasites like hookworms, have all been linked to pica as well. Some researchers suspect neurological disturbances in appetite control could drive cats to crave unusual textures, though a clear nutritional deficiency has never been confirmed as a direct cause.
Breed Can Play a Role
Oriental breeds, particularly Siamese and Burmese cats, show up more frequently in pica research. These breeds are known for being more orally fixated in general, with higher rates of wool-sucking and fabric-eating. If you have a Siamese-type cat that obsessively licks or chews plastic, the behavior may have a genetic component layered on top of the environmental and sensory factors.
Why You Should Take It Seriously
Occasional licking of a plastic bag is not an emergency, but the behavior carries real risks if your cat progresses to chewing and swallowing pieces. Plastic fragments can cause gastrointestinal blockages, which are life-threatening. Signs of a blockage include vomiting, loss of appetite, lethargy, diarrhea, abdominal pain, and a visibly distended belly. Thin plastic, like bag handles or cling wrap, can behave like a linear foreign body, anchoring at one point (sometimes under the tongue) while the rest travels through the intestines, causing the tissue to bunch up like an accordion. This can lead to intestinal perforation and severe internal infection.
There’s also a subtler chemical concern. Plastics contain compounds called phthalates, which are used to make materials flexible and are found in everything from cables to toys to household items. These chemicals leach out over time and can enter a cat’s body through licking, ingestion, or even skin contact. A 2025 study published in Nature found phthalate byproducts in 100% of cat hair samples tested. Phthalates can disrupt hormones and affect the reproductive, digestive, and nervous systems. Cats are especially vulnerable because, unlike dogs, they lack the ability to efficiently break down and clear most of these chemicals from their bodies.
How to Reduce the Behavior
The first step is straightforward: remove the opportunity. Store plastic bags in closed cabinets or switch to reusable cloth bags. If your cat targets specific items like shower curtains or packaging, limit access to those areas.
Boredom and under-stimulation are among the most common drivers of plastic licking in indoor cats, so increasing environmental enrichment often makes a noticeable difference. Puzzle feeders, both dry-food dispensing balls and hollow toys stuffed with wet food, give your cat a way to work for meals that satisfies their hunting instincts. Offering cat-safe plants and grasses can redirect the desire to chew. Live wheatgrass or fresh catnip gives your cat an appropriate texture to mouth and nibble on.
If the behavior is frequent, intense, or accompanied by actual ingestion of plastic, it’s worth investigating medical causes. A vet can check for anemia, gastrointestinal disease, and parasites, all of which are treatable. For cases that appear behavioral, addressing anxiety or compulsive tendencies through environmental changes and, in some cases, medication has shown results in clinical settings.