Cats chew on metal for several possible reasons, ranging from teething and boredom to a condition called pica, where cats compulsively eat or chew non-food items. Metal objects like zippers, hardware, jewelry, and cords seem to attract some cats because of the cool temperature, smooth texture, or the interesting sensation against their teeth and gums. Understanding the cause matters, because some triggers are harmless while others signal a health problem that needs attention.
Pica: The Most Common Explanation
Pica is the term for compulsively chewing or eating non-food materials, and it’s the leading explanation when a cat fixates on metal. The behavior can target all sorts of objects (fabric, plastic, rubber, wood), but metal is a common favorite. A case-control study in the Journal of Feline Medicine and Surgery identified several overlapping causes, and most cats with pica have more than one factor at play.
Boredom and lack of social contact are among the biggest contributors. Cats are natural hunters, and when their environment doesn’t give them enough to do, that predatory energy can redirect toward chewing. Indoor cats with limited enrichment are especially prone. Anxiety is another driver. Some researchers classify pica as a compulsive disorder triggered by chronic stress, similar to obsessive-compulsive behavior in humans. Cats that are very attached to their owners and left alone for long stretches may chew as a coping mechanism, much like nail-biting in people.
Genetics and early life experiences also play a role. Cats weaned too early (before 8 weeks) are more likely to develop pica, possibly because the behavior starts as redirected suckling. Certain breeds, particularly Siamese and Burmese lines, appear predisposed. Research from Cornell’s College of Veterinary Medicine found that pica often starts around puberty, frequently beginning with fabric and then expanding to other materials, including metal, as the cat matures.
Teething in Kittens
If your cat is under seven months old, teething is the simplest explanation. Kittens begin losing baby teeth and growing adult teeth as early as 3 months, starting with the front incisors. The canine teeth (fangs) come in around 5 months, and the premolars and molars fill in between 4 and 7 months. During this window, gums are sore and swollen, and chewing on hard, cool surfaces provides relief. Metal fits the bill perfectly because it’s firm, smooth, and cooler than room temperature.
Teething-related chewing almost always resolves on its own once the adult teeth are fully in. Offering safe chew toys designed for kittens can redirect the behavior away from metal objects in the meantime.
Medical Conditions Worth Ruling Out
Pica isn’t always behavioral. Several medical problems can trigger the urge to chew non-food items, and metal chewing that appears suddenly in an adult cat warrants a vet visit.
Anemia is one of the more well-documented links. Cats with iron deficiency or immune-mediated hemolytic anemia (a condition where the body destroys its own red blood cells) develop pica at notably high rates. The theory is that the body craves minerals it’s lacking, which may explain why metal specifically appeals to some anemic cats. Two separate studies found a high prevalence of pica in cats diagnosed with immune-mediated hemolytic anemia.
Gastrointestinal disorders are another possibility. Inflammatory bowel disease, stomach motility problems, and even hookworm infestations have all been associated with pica. In these cases, the chewing may reflect nausea, discomfort, or disrupted appetite signals rather than a behavioral quirk. Neurological disturbances in appetite control can also produce unusual cravings.
A vet will typically start with a physical exam and a detailed history of the behavior, then run blood work, urine tests, and sometimes a fecal sample to screen for underlying illness.
Why Metal Can Be Dangerous
Beyond the obvious risk of broken teeth or mouth injuries, chewing metal introduces two serious toxicity concerns: lead and zinc.
Lead poisoning in cats most often comes from old paint (responsible for 84% of confirmed cases in one review), but lead also hides in solder, fishing weights, curtain weights, ammunition, wheel weights, and some older plumbing materials. Cats that chew on these items can develop loss of appetite (sometimes the only symptom), vomiting, and seizures. Seizures are the most commonly reported neurological sign of lead toxicity in cats. Other symptoms include uncoordinated movement, head tremors, abnormal eye movements, and extreme lethargy or agitation.
Zinc poisoning is the other major risk. Pennies minted after 1982 are mostly zinc with a thin copper coating, and other common sources include nuts, bolts, zippers, board game pieces, and galvanized hardware. Zinc toxicity unfolds in two phases. The first phase brings vomiting, diarrhea, loss of appetite, and lethargy, sometimes within minutes but sometimes not for days, depending on how quickly zinc leaches from the object. The second phase, which can follow hours to days later, involves destruction of red blood cells, liver and kidney damage, and in severe cases, death. If you suspect your cat has swallowed a zinc-containing object, treat it as an emergency.
How to Stop the Behavior
The right approach depends on the cause, so start by addressing any medical issues first. If your vet rules out underlying illness, the focus shifts to environmental changes and behavior management.
Remove access to metal objects wherever possible. This sounds obvious, but it’s the single most effective step. Put away loose hardware, jewelry, paper clips, and anything else your cat targets. Think of it the same way you’d childproof a home.
Bitter apple spray or spicy deterrent sprays can make remaining metal surfaces unappealing. Apply the spray to the objects your cat chews, and reapply daily for two to four weeks until the habit breaks. These sprays work best as part of a broader strategy, not as a standalone fix.
Enrichment is critical. Increase playtime, rotate toys every few days to keep things novel, and provide acceptable chew alternatives. Pay attention to what your cat gravitates toward and offer toys with a similar texture or firmness. Interactive toys that mimic prey, puzzle feeders, and regular play sessions that let your cat “hunt” can channel that redirected predatory energy into something safe. A tired, mentally stimulated cat is far less likely to chew compulsively.
For cats whose pica stems from anxiety or compulsive behavior, reducing stressors in the environment helps. This might mean adding vertical spaces, providing hiding spots, keeping a consistent routine, or in some cases, working with a veterinary behaviorist. Dietary changes can also make a difference. Some cats reduce or stop chewing non-food items when switched from wet to dry food or given access to cat grass, suggesting that the craving for texture or fiber plays a role in the behavior.