Can Rats Eat Tuna? — In Moderation [Vet Guide 2026]

Answer

⚠️ Moderate

Safe Serving

Small amount occasionally

Risk Level

Moderate

⚠️ Avoid

Tuna in oil or brine — mercury risk

⚠️ Caution — Very Small Amounts Only

Plain canned tuna occasionally for rats for Rats.

Is Tuna Safe for Rats?

Tuna is not directly toxic to Rats but must only be offered occasionally and in very small amounts. Plain canned tuna occasionally for rats for Rats. Feeding too much or too frequently causes digestive problems and potential long-term health issues.

Mercury accumulation risk if fed too often. When introducing Tuna for the first time, start with a smaller amount than recommended and wait 24 hours to check for any adverse reaction before offering more.

⚠️ Always avoid: Tuna in oil or brine — mercury risk — these parts should never be given to your Rat.

Risk: ModerateModerate — use caution

How to serve Tuna to your Rat

Remove Tuna in oil or brine — mercury risk completely before preparing.
Start with half of Small amount occasionally — wait 24 hours before offering more.
Serve plain only — no seasoning, salt, sugar, or additives.
Keep treats under 10% of your Rat's daily calorie intake.

Nutrition — Tuna

Safety	⚠️ Use caution
Frequency	1–2× per week
Amount	Very small only
Monitor	Watch 24 hours

Vet tips for Rat owners

💡"In moderation" means once or twice a week maximum — never daily.
💡Monitor your Rat for 2–4 hours after first giving Tuna for vomiting or unusual behaviour.
💡If your Rat has any pre-existing health conditions, ask your vet before offering Tuna.
💡When in doubt, leave it out — there are plenty of fully safe treat alternatives.