My Cat Is Not Eating: Causes, When to Worry, and What to Do

If your cat is not eating, it's one of the most worrying things a pet owner can experience. Cats are creatures of habit and routine — when a cat suddenly stops eating or dramatically reduces food intake, it's almost always a sign that something is wrong.

This guide covers the most common reasons a cat won't eat, when it becomes a veterinary emergency, and what you can do at home to stimulate your cat's appetite.

How Long Can a Cat Go Without Eating?

This is the most important number to know: a cat should not go more than 24–48 hours without eating. Unlike dogs, cats that stop eating for too long can develop a serious liver condition called hepatic lipidosis (fatty liver disease). This condition develops when the body breaks down fat stores too quickly for the liver to process, and it can be fatal if not treated.

If your cat has not eaten for more than 24 hours, contact your vet.

Common Reasons a Cat Won't Eat

1. Illness or Pain

This is the most important cause to rule out first. Almost any illness — from kidney disease to dental pain to respiratory infections — can cause a cat to stop eating. Other signs to watch for alongside appetite loss: lethargy, hiding, vomiting, diarrhea, weight loss, or changes in thirst.

2. Dental Problems

Dental pain is one of the most underdiagnosed causes of appetite loss in cats. A broken tooth, abscess, or severe gum disease makes eating painful. Cats are masters at hiding pain — by the time you notice they're not eating, the dental issue may be advanced. Look for pawing at the mouth, drooling, or preference for soft food.

3. New Food or Changed Diet

Cats are famously finicky eaters. If you recently switched food brands, changed flavors, or even switched from one lot to another of the same food, your cat may refuse to eat. Cats can detect minute differences in taste, texture, smell, and even the shape of kibble.

4. Stress or Anxiety

Any change in environment can trigger appetite loss in cats: a new home, new pet, new baby, changes in your schedule, construction noise, or even rearranging furniture. Stressed cats often hide, over-groom, or vocalize more as well.

5. Vaccination Side Effects

Some cats experience temporary appetite loss for 24–48 hours after vaccination. This is normal and usually resolves on its own. If it lasts longer, contact your vet.

6. Motion Sickness After Travel

Car trips can cause nausea in cats, which suppresses appetite. This usually resolves within a few hours of arriving home.

7. Respiratory Infection

Cats depend heavily on smell to identify food. When they're congested from an upper respiratory infection, they literally can't smell their food — and cats won't eat what they can't smell. Look for sneezing, runny nose, or eye discharge alongside appetite loss.

8. Medication Side Effects

Certain medications, including antibiotics and some pain medications, cause nausea or appetite suppression in cats. If your cat recently started a new medication, this could be the cause.

9. Spoiled Food or Dirty Bowl

Cats have a highly sensitive sense of smell. Old food left in the bowl, a dirty bowl with residue from previous meals, or food stored near strong smells can cause refusal to eat. Wash your cat's bowl with hot water and mild soap after every meal.

10. Overfeeding Treats

If your cat gets lots of treats or human food scraps, they may simply be holding out for something better. Treats should make up no more than 10% of a cat's daily caloric intake.

Warning Signs: When to Go to the Vet Immediately

Call your vet right away if your cat:

• Has not eaten for more than 24 hours
• Is also vomiting repeatedly
• Has diarrhea alongside appetite loss
• Seems lethargic, weak, or unusually quiet
• Is losing weight rapidly
• Has a yellow tinge to the skin or whites of the eyes (jaundice — a sign of liver disease)
• Is a kitten under 6 months old
• Has a known underlying health condition

What to Do If Your Cat Isn't Eating: Home Strategies

If your cat has missed one meal and seems otherwise normal (no other symptoms, active, alert), try these strategies before calling the vet:

Warm the Food

Warming food to body temperature (~100°F / 37°C) releases aromas that stimulate appetite. Microwave canned food for 10–15 seconds and stir well to eliminate hot spots.

Try a Different Texture

If your cat normally eats dry kibble, try offering wet food. The stronger aroma and higher moisture content often tempt reluctant eaters.

Add a Food Topper

A small amount of tuna water (no salt added), chicken broth (no onion or garlic), or commercially available appetite stimulant toppers can encourage eating.

Try a New Bowl or Location

Some cats won't eat from a bowl that's too deep (whisker fatigue), too dirty, or placed in a high-traffic area. Try a wide, shallow plate and a quiet location.

Reduce Stress

If you've recently made changes at home, try to restore routine. Keep feeding times consistent, provide hiding spots, and offer interactive play sessions to reduce anxiety. Our cat supplies collection includes enrichment toys that help anxious cats feel more secure.

Check the Food Hasn't Expired

Dry kibble can go stale once opened — especially if stored in a warm or humid environment. Check the expiration date and store in an airtight container.

Kitten Not Eating: Special Concerns

Kittens have very small energy reserves and can decline quickly. A kitten under 6 months that hasn't eaten for 12 hours is a veterinary emergency. Don't wait to see if they start eating on their own.

Senior Cat Not Eating

Loss of appetite in senior cats (7+ years) is more likely to have an underlying medical cause such as kidney disease, hyperthyroidism, or cancer. Senior cats should see a vet sooner — don't wait 24 hours if your older cat is refusing food.

Final Thoughts

A cat not eating is always worth taking seriously, but it's not always a crisis. Assess the situation: how long has it been, are there other symptoms, and what has changed recently? If it's been less than 24 hours and your cat seems otherwise well, try the home strategies above. If there are any other symptoms, or if the food refusal continues past 24 hours, your vet is the right next call.

Keep your cat happy, healthy, and entertained with our range of cat toys, feeders, and enrichment products — because a stimulated cat is usually a hungry cat.