Why is my old cat not eating? 10 causes and what to do

Your senior cat, who once came running at the sound of a can opening, now turns away from their food bowl. A cat refusing to eat is always concerning, but in senior cats, it can quickly become dangerous. Cats who don't eat for even a few days can develop serious liver problems, making it critical to identify and address the cause quickly.

Understanding why your old cat has stopped eating will help you know when to try home remedies and when to rush to the veterinarian.

Why appetite loss in senior cats is serious

Unlike dogs and humans, cats cannot safely go without food for extended periods. When a cat stops eating, their body begins breaking down fat stores for energy. However, cat livers aren't efficient at processing fat, and the fat can accumulate in the liver, causing a condition called hepatic lipidosis (fatty liver disease).

Hepatic lipidosis can develop in as little as 2-3 days of not eating in overweight cats, and within a week even in cats of normal weight. It's life-threatening and requires intensive veterinary treatment. This is why a senior cat who refuses food for more than 24-48 hours needs veterinary attention, even if they seem otherwise okay.

10 common causes of appetite loss in senior cats

1. Dental disease

By the time cats reach their senior years, most have some degree of dental disease. Painful teeth, inflamed gums, tooth resorption (a painful condition where teeth dissolve), or oral tumors can make eating excruciating. Cats are masters at hiding pain, so they may simply stop eating rather than show obvious signs of a toothache.

Signs of dental pain include drooling (sometimes with blood), dropping food while eating, head tilting while chewing, and preferring soft food over dry. However, many cats show no signs at all, they just stop eating.

2. Chronic kidney disease

Kidney disease affects up to 30% of cats over age 15 and is one of the most common causes of appetite loss in senior cats. As kidney function declines, toxins build up in the bloodstream, causing nausea, mouth ulcers, and a general feeling of unwellness that suppresses appetite.

Other signs include increased thirst and urination, weight loss, vomiting, and poor coat quality. Kidney disease cannot be cured but can often be managed effectively with diet, fluids, and medications, especially when caught early.

3. Hyperthyroidism

This common hormone disorder causes an overproduction of thyroid hormone, which revs up metabolism. While many hyperthyroid cats have increased appetite initially, as the disease progresses, some cats develop nausea and stop eating. Vomiting, weight loss despite eating, increased thirst, and hyperactivity are other common signs.

4. Gastrointestinal problems

Inflammatory bowel disease (IBD), pancreatitis, intestinal lymphoma, and other GI conditions can cause nausea, vomiting, and appetite loss. These conditions are common in senior cats and may develop gradually, with decreasing appetite being an early sign.

5. Cancer

Various cancers can cause appetite loss, either through direct effects on the digestive system, pain, nausea, or the general malaise that often accompanies cancer. Lymphoma is the most common cancer in cats and can affect the intestines, causing weight loss and decreased appetite.

6. Loss of smell

Cats rely heavily on smell to stimulate their appetite. Upper respiratory infections, nasal polyps, or simply age-related decline in the sense of smell can make food unappealing. If your cat sniffs their food and walks away, reduced smell sensation may be part of the problem.

7. Pain

Any source of pain can suppress appetite. Arthritis, which affects most senior cats to some degree, may make it painful to walk to the food bowl or crouch down to eat from a floor-level dish. Other painful conditions like urinary problems, constipation, or injuries can also cause appetite loss.

8. Stress and anxiety

Cats are sensitive to changes in their environment. A new pet, a new family member, moving, renovations, changes in routine, or even rearranging furniture can stress some cats enough to affect their appetite. Senior cats may be especially vulnerable to stress-induced appetite loss.

9. Medication side effects

Some medications commonly prescribed to senior cats can affect appetite. Antibiotics, pain medications, and certain other drugs may cause nausea or change how food tastes. If appetite loss started after beginning a new medication, mention this to your veterinarian.

10. Food aversion

Cats can develop aversions to food they associate with feeling ill. If your cat ate a particular food while nauseous from another cause, they may refuse that food even after recovering. Similarly, cats may reject food that has changed in formulation, flavor, or even packaging.

When to see the veterinarian immediately

Seek urgent veterinary care if your cat:

• Hasn't eaten anything for more than 24-48 hours
• Is also not drinking water
• Is vomiting repeatedly
• Has diarrhea or constipation
• Is lethargic or hiding
• Has yellow-tinged skin, gums, or eyes (jaundice, a sign of liver problems)
• Is breathing rapidly or with difficulty
• Shows signs of pain (crying, aggression, hunched posture)
• Has a known medical condition like diabetes or kidney disease

What to expect at the vet

Your veterinarian will perform a thorough examination and likely recommend diagnostic tests, which may include:

• Blood work: Checks kidney and liver function, blood sugar, thyroid levels, and blood cell counts
• Urinalysis: Provides additional information about kidney function and checks for infection
• X-rays: Can reveal intestinal obstructions, tumors, or other problems
• Ultrasound: Provides detailed images of abdominal organs
• Dental exam: May require sedation for a thorough evaluation

Treatment will depend on the underlying cause. Many cats also receive supportive care such as anti-nausea medication, appetite stimulants, fluids for dehydration, and nutritional support while the underlying problem is being addressed.

Encouraging a picky senior cat to eat

While you're waiting for a vet appointment or working with a diagnosis, these strategies may help encourage eating:

Make food more appealing

• Warm the food: Heating food to body temperature (around 100°F) releases aromas that stimulate appetite. Microwave for a few seconds and test the temperature to avoid hot spots.
• Try strong-smelling foods: Fish-based foods, meat baby food (without onion or garlic), or a small amount of tuna water may entice a reluctant eater.
• Offer variety: Try different flavors, textures (pate vs. chunks), and brands. Sometimes a new food sparks interest.
• Hand feed: Some cats will eat from your hand when they won't eat from a bowl.

Optimize the feeding environment

• Use shallow bowls: Whisker fatigue from deep bowls can discourage eating. Use flat dishes or saucers.
• Elevate the food: Arthritic cats may eat more comfortably from a raised dish.
• Move the bowl: Place food away from litter boxes and in a quiet, safe location.
• Reduce competition: If you have multiple cats, provide separate feeding stations.
• Keep it fresh: Cats often reject food that's been sitting out. Offer small amounts frequently.

Medical aids (with vet approval)

• Appetite stimulants: Medications like mirtazapine (available as a pill or transdermal ointment) can significantly boost appetite in cats. Your vet can prescribe this.
• Anti-nausea medication: If nausea is suspected, medications like ondansetron or maropitant can help.
• B12 supplementation: Cats with GI problems often have B12 deficiency, which can affect appetite.

Syringe feeding: a last resort

If your cat won't eat voluntarily and your vet recommends nutritional support, you may need to syringe feed. This involves using a small syringe (without the needle) to deliver liquid food or a slurry made from regular food.

Important guidelines for syringe feeding:

• Only do this if your vet has recommended it and shown you the proper technique
• Use food formulated for syringe feeding or create a smooth slurry your vet approves
• Feed small amounts slowly, allowing your cat to swallow
• Never force food into a cat's mouth quickly as this can cause aspiration (food entering the lungs)
• Stop if your cat is very stressed; stress can worsen their condition

Cats who need long-term nutritional support may benefit from a feeding tube, which sounds drastic but is actually well-tolerated by most cats and removes the stress of syringe feeding.

Preventing appetite problems

Regular veterinary care is the best prevention. Senior cats should see the vet at least twice yearly for wellness exams that include blood work. Early detection of conditions like kidney disease, hyperthyroidism, and dental disease allows treatment before appetite is severely affected.

At home, weigh your cat monthly on a baby scale or by weighing yourself holding the cat, then subtracting your weight. Subtle weight loss is often the first sign of a problem and may be noticed before appetite obviously decreases.

A senior cat who stops eating is always telling you something. While the cause may be as simple as a food preference or as complex as underlying disease, prompt attention is essential. With proper diagnosis and treatment, many causes of appetite loss in senior cats can be managed, helping your feline friend enjoy their golden years with a full belly and a content purr.