US Trends

can cats have tuna

Yes, cats can have tuna, but only in small amounts and with a few important safety rules in mind. It should be an occasional treat, not a regular meal, and the type of tuna and how it’s prepared really matter for your cat’s health.

Can Cats Have Tuna? (Quick Scoop)

The Very Short Answer

  • Yes: Small amounts of plain, cooked or canned tuna in water as an occasional treat.
  • No: Regular tuna meals, tuna in oil or brine, seasoned tuna, or raw tuna.
  • Rule of thumb: Tuna should be less than about 10% of your cat’s overall diet and not every day.

What Kind of Tuna Is Safest?

Think “simple and plain” whenever you share tuna with a cat.

  • Best choices
    • Cooked, unseasoned tuna (no salt, garlic, onion, spices, butter, or oil).
* Canned tuna in spring water / plain water, with no added salt or flavourings.
  • Avoid these
    • Tuna in oil (can upset the stomach and add unnecessary fat).
* Tuna in brine (very salty; can cause electrolyte imbalance and stress the kidneys and heart).

* Seasoned or flavoured tuna (may contain onion, garlic, extra salt, or sauces that are unsafe for cats).

* Raw tuna (risk of bacteria, parasites, and thiamine/Vitamin B1 deficiency).

Simple example

A teaspoon of plain, cooked tuna or canned tuna in water, offered once or twice a week as a treat alongside a complete cat food, is usually considered a safe pattern.

Why Too Much Tuna Is a Problem

Cats love tuna, but there are several hidden risks when they get it too often.

1. Mercury build‑up

  • Tuna (especially larger species like albacore) can contain relatively high levels of mercury.
  • Over time, too much mercury can affect the nervous system and overall health.

2. Unbalanced nutrition

  • Tuna alone doesn’t have the precise balance of vitamins, minerals, and amino acids that complete cat food provides.
  • A cat that fills up on tuna may eat less of their proper food and end up deficient in essential nutrients (for example, certain vitamins or minerals).

3. Vitamin B1 (thiamine) issues with raw fish

  • Raw fish, including raw tuna, contains thiaminase, an enzyme that breaks down Vitamin B1 (thiamine).
  • Long‑term raw fish feeding can cause thiamine deficiency, leading to neurological signs like wobbliness, seizures, or behaviour changes.

4. Salt, oil, and additives

  • Brine (salt water) and heavily salted tuna can disturb your cat’s electrolyte balance and strain the kidneys.
  • Oils, sauces, and seasonings can cause stomach upset, pancreatitis risk, or exposure to toxic ingredients like onion or garlic.

How Often Can You Safely Give Tuna?

Most vets and pet nutrition guides treat tuna as a treat , not a diet base.

  • Portion guidance
    • Roughly 1–2 teaspoons of plain tuna once or twice per week is a typical “safe treat” range for a healthy adult cat.
* Tuna treats should stay under about 10% of your cat’s daily calories, with the rest coming from a complete, balanced cat food.
  • Good ways to use tuna
    • To hide a pill or medication (a small “tuna wrap”).
* As a high‑value reward for a stressful event (e.g., after a vet visit).
* As a rare “special occasion” treat rather than a daily snack.
  • Not recommended
    • Feeding a whole can of tuna at once or regularly.
* Letting a tuna habit replace your cat’s complete wet/dry food.

Signs You Should Cut Back or Call a Vet

If your cat has been getting a lot of tuna or stole a big amount, watch for warning signs.

  • Possible concern signs
    • Vomiting or diarrhoea.
    • Reduced appetite for normal food.
    • Lethargy, unusual weakness, or wobbliness.
    • Behaviour changes or neurological signs (twitching, seizures).
  • When to call your vet
    • Your cat ate a large quantity (like most or all of a can) and is very small, elderly, or has kidney/heart issues.
    • You’ve been feeding tuna frequently for weeks or months and notice weight loss, dull coat, or reduced energy.

Your vet can advise if blood tests or diet changes are needed and help you design a safer treat routine.

Quick HTML Table: Tuna & Cats

Here’s a simple HTML table you can reuse:

html

<table>
  <thead>
    <tr>
      <th>Type of tuna</th>
      <th>Is it okay for cats?</th>
      <th>Notes</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Canned tuna in water (no salt)</td>
      <td>Occasionally, in small amounts</td>
      <td>Use 1–2 teaspoons once or twice a week as a treat, not a meal.[web:1][web:3][web:5]</td>
    </tr>
    <tr>
      <td>Cooked, unseasoned tuna</td>
      <td>Occasionally, in small amounts</td>
      <td>Must be thoroughly cooked, plain, and served alongside a balanced cat food.[web:1][web:3][web:5]</td>
    </tr>
    <tr>
      <td>Raw tuna</td>
      <td>Not recommended</td>
      <td>Risk of bacteria, parasites, and thiamine deficiency with repeated feeding.[web:1][web:5]</td>
    </tr>
    <tr>
      <td>Tuna in oil</td>
      <td>Avoid</td>
      <td>Extra fat can upset the stomach and doesn’t add nutritional benefit.[web:1][web:3]</td>
    </tr>
    <tr>
      <td>Tuna in brine (salt water)</td>
      <td>Avoid</td>
      <td>High salt can cause electrolyte imbalance and stress kidneys and heart.[web:1][web:7][web:9]</td>
    </tr>
    <tr>
      <td>Flavoured/seasoned tuna (e.g., garlic, onion, sauces)</td>
      <td>Avoid</td>
      <td>May contain ingredients that are toxic or irritating to cats.[web:3]</td>
    </tr>
    <tr>
      <td>Cat food with tuna (formulated)</td>
      <td>Yes</td>
      <td>Designed to be nutritionally complete; follow the product’s feeding guide.[web:3][web:7][web:9]</td>
    </tr>
  </tbody>
</table>

Little “Story” Scenario

Imagine your cat hears the can opener and sprints into the kitchen like it’s the greatest moment of their life.
You open a can of tuna, give them one tiny spoonful of plain tuna in water, and then put the rest away for yourself.
Later, they still eat their normal cat food, nap in their favourite spot, and you both go on with your day. That’s pretty much the ideal way for cats to have tuna: small, plain, occasional, and never a replacement for real cat food.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.