Cat Not Eating? Here's Why It's More Urgent Than It Seems
A cat skipping a meal or two isn't always a problem — but cats are different from dogs in one important way: going without food for more than about 24 hours can lead to a serious liver condition (hepatic lipidosis), especially in overweight cats. That makes appetite loss in cats something to take seriously sooner than you might think.
Common causes
- Stress — a new pet, a move, changes at home
- Dental pain, which can make eating uncomfortable
- A mild upper respiratory infection affecting smell (cats rely heavily on smell to want to eat)
- Gastrointestinal upset
- More serious underlying conditions — kidney disease, hyperthyroidism, or other systemic illness, especially in older cats
When to call the vet
- Not eating at all for more than 24 hours
- Eating noticeably less than usual for more than 2 days
- Appetite loss combined with vomiting, diarrhea, lethargy, or hiding more than usual
- Any weight loss you can see or feel
- An overweight or obese cat refusing food — this group is at the highest risk for hepatic lipidosis
What you can try in the meantime
Offering a different, strong-smelling food (warming wet food slightly can help), reducing stress in the environment, and making sure fresh water is available. If your cat shows any interest but isn't eating much, that's still worth mentioning to your vet rather than waiting to see if it resolves.
PetCare can help you track how long your cat has gone without eating and what else you've noticed, then give you an urgency level. Given how quickly appetite loss can become serious in cats, treat 24 hours of not eating as a reason to call your vet regardless of what any app says.
This guide is for general information only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is showing severe symptoms, contact a veterinarian or emergency animal hospital right away.