Is My Cat Sick? Litter Box, Hairball, Teeth and Kidney Clues

Your cat could be feeling rotten and still act almost normal. That's not toughness, it's instinct. The good news: once you know where to look, your cat leaves you clues every single day. Here's how to read them.

Masters of hiding it

In the wild, a sick or injured animal is a target. Cats descend from solitary desert hunters, and hiding weakness kept them alive. That instinct is alive and well in your living room, which is why cats' health problems are so often caught late.

So watch for small changes: in appetite or thirst, hiding more than usual, less grooming (a dull, matted coat is a warning), weight loss, bad breath, or sudden over-grooming of one spot. Mood shifts matter too, like a social cat going withdrawn or a calm cat turning irritable.

Some signs can't wait: straining in the litter box (especially in male cats, who can suffer a fatal urinary blockage), labored breathing, repeated vomiting, or refusing food for more than 24 hours. Your cat can't tell you it hurts, so a sudden change in routine is its loudest signal. When something feels off, trust your gut and call your vet.

The litter box: a daily health report

It's the least glamorous part of cat life, but the litter box is one of your best health tools. A healthy adult cat typically urinates two to four times a day and passes one firm, well-formed stool. Learn what's normal for your cat so you notice when it changes.

Tiny, frequent urine clumps, or a cat straining and producing little, can signal a urinary problem, and in male cats a blockage can become life-threatening within hours. Diarrhea, hard pellet-like stools, blood, or a sudden change in color or smell all deserve attention. And going outside the box usually isn't spite: it's often pain, stress or a medical issue like a urinary infection or kidney disease.

Keep boxes clean and follow the classic rule: one box per cat, plus one extra. If worrying changes last more than a day or two, call your vet.

Hairballs: normal, until they're not

That dramatic 3 a.m. hacking? Mostly normal. Cats spend up to 50% of their waking hours grooming, and their tongues are covered in tiny backward-facing barbs that catch loose fur. Most of it passes through, but some collects in the stomach and comes back up. One or two hairballs a month is no cause for alarm. Longhairs like Persians and Maine Coons get more, and regular brushing cuts down how much fur they swallow.

Time to worry: several hairballs a week, repeated retching that brings nothing up, loss of appetite, lethargy, constipation or a swollen belly. These can signal a dangerous intestinal blockage. When in doubt, call your vet, because a blockage is an emergency.

Teeth and kidneys: the quiet ones

By age 3, about 70% of cats have some form of dental disease, and many still eat normally while in pain, just shifting food to the other side of the mouth. Watch for drooling, pawing at the mouth, dropping food and bad breath that goes beyond normal "cat breath." Cat-specific toothpaste and dental treats help (never human toothpaste: fluoride is toxic to cats), and annual dental checkups with your vet are essential.

Kidney disease is one of the most common serious illnesses in older cats, and it's sneaky. Early clues are drinking and peeing more than usual, weight loss, a duller coat, bad breath and a smaller appetite. Ask your vet about routine blood and urine tests for cats over seven, including the SDMA marker, which can catch trouble years earlier than older tests. Keep fresh water everywhere, consider wet food for extra moisture and never skip annual checkups. If you spot the warning signs, don't wait. Caught early, kidney disease is manageable, and cats can live happily for years with the right diet and care.

Did you know? The tiny barbs on a cat's tongue are so good at grabbing fur that researchers have studied them to design better hairbrushes.

You know your cat better than anyone. Keep an eye out, trust that hunch, and your vet will do the rest. 🐾