Cat Not Eating After Spay/Neuter: Is It Normal? When to See a Vet?

Back from the vet after a spay/neuter surgery, and your pet immediately goes on a hunger strike. This is one of the most common concerns among pet owners after a sterilisation procedure. The question is: when is this still normal, and when should you start to worry?

The answer isn't black and white. There's a time window, associated symptoms to watch for, and the right ways to help your pet start eating again.

Why Won't a Cat Eat After Being Spayed/Neutered?

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There are several different causes — it's important to understand which one applies to your pet:

1. Residual Anaesthetic Effect (Most Common)

Anaesthesia suppresses the central nervous system and causes nausea. This effect usually wears off within 12–24 hours, but can persist up to 48 hours in some cats. Your cat will appear lethargic, unresponsive, and completely uninterested in food.

2. Stress & Disorientation

Cats are highly sensitive to environmental changes. The smell of the clinic, contact with unfamiliar animals, and the surgical experience itself can cause stress that suppresses appetite. This usually resolves once your cat feels safe and comfortable at home again.

3. Mild Post-Operative Pain

It's natural for the surgical site to feel uncomfortable. Pain that is well-managed (via pain medication from your vet) shouldn't cause your cat to refuse food for more than 1–2 days. If pain appears severe, consult your vet about adjusting the dosage.

4. Complications (Requires Veterinary Attention)

If not eating is accompanied by repeated vomiting, a festering wound, fever, or extreme lethargy — there may be a more serious issue such as infection or a drug reaction. This is not a normal anaesthetic effect and requires immediate veterinary evaluation.

Timeline Guide: Normal vs. See a Vet

Time After Surgery	Status	Action
0–6 hours	Normal	No need to offer food. Let your cat rest.
6–24 hours	Normal	Offer water first. If accepted, try a small amount of warm wet food.
24–48 hours	Monitor	Still could be normal. Try various favourite foods. Watch closely.
More than 48 hours	Not Normal	Contact your vet. Evaluation may be needed, possibly a feeding tube or syringe feeding.

How to Stimulate Your Cat's Appetite After Surgery

Warm Up Wet Food

Microwave canned food for 10 seconds and stir well. The aroma of warm food is much stronger and more enticing. Make sure it's not too hot before serving.

Use Their Favourite Food

This is not the time to switch brands. Use whatever your cat loves most, even if it's not the healthiest option for everyday feeding.

Hand-Feed

Some stressed cats will eat from their owner's hand even when refusing a bowl. Try dabbing a small amount of food on your fingertip and bringing it close to their nose.

Add Broth

Add a little plain, salt-free, onion-free chicken broth to their food. This enhances the aroma and creates a softer, easier-to-eat texture. It can also be offered as a drink.

Create a Calm Environment

Place the bowl in a quiet spot away from noise and activity. Don't force or crowd your cat. A stressed cat needs peace and quiet before they'll start to eat.

Fortasyn or Mirtazapine

If your cat absolutely won't eat after 48 hours, a vet can prescribe an appetite stimulant such as mirtazapine (available as an ear-applied cream). Never give this without a prescription.

What NOT to Do

Don't force-feed with a syringe without veterinary guidance — risk of aspiration (food entering the lungs)
Don't give human stomach medicines or vitamins such as antacids, B12 tablets, etc. — some are toxic to cats
Don't add seasoning or soy sauce to food to make it more appealing — this can cause poisoning
Don't wait too long if there are other symptoms beyond loss of appetite — the sooner you see a vet, the better

Worried About Your Pet's Recovery After Surgery?

Birawa Vet offers home visit services for post-spay/neuter evaluations — no need to bring your still-recovering pet to a clinic. Our vet will check the wound, ensure recovery is on track, and prescribe additional medication if needed.

View Our Post-Spay/Neuter Home Care Service

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Frequently Asked Questions

How long is it normal for a cat not to eat after being spayed/neutered?

Up to 48 hours (2 days) after surgery is still considered normal. Anesthesia and surgical stress suppress appetite. If your cat is still completely refusing food by day 3, contact your vet immediately.

What should I do if my cat won't eat after being spayed/neutered?

Try offering slightly warmed wet food (canned) — the stronger aroma and soft texture make it easier to eat. You can also try a tiny portion of your cat's favourite food. Never force-feed with a syringe unless instructed by your vet. Make sure fresh water is always available.

Does a cat that won't eat after surgery need an IV drip?

Usually not, as long as your cat is still drinking water. If your cat refuses both food AND water for more than 48 hours, or shows signs of dehydration (skin that doesn't snap back, sunken eyes, dry gums), your vet may need to administer subcutaneous or IV fluids. Consult your vet.

Why is my cat vomiting after being spayed/neutered?

Vomiting 1–2 times on the first day is a common side effect of anesthesia. Anesthetic drugs act on the central nervous system and can trigger nausea. If vomiting occurs more than 3 times in a day, or continues into day 2 and beyond, this is no longer a normal anesthetic effect and needs to be evaluated by a vet.

Can I give my cat vitamins or supplements after surgery?

Yes, but wait until appetite returns (day 3 or once normal eating resumes). Supplements like B-complex vitamins or probiotics can support recovery. However, don't give over-the-counter pet supplements without consulting your vet — some products may interact with prescribed antibiotics.

Cat Not Eating After Spay/Neuter: Normal or Dangerous?