Why?
Sardines are rich in protein and omega-3s, and their bones, softened by canning, add calcium. But they're oily and high in calories: too many can cause weight gain and diarrhea. Sardines in oil are even fattier, and those in tomato or spicy sauce contain salt and sometimes garlic or onion. Fresh sardines must be cooked.
How much?
Half a canned sardine, packed in water with no added salt, about once a week. Drain it and mash it into the food. If it's fresh, steam or poach it with no salt and remove the backbone.
The risks
- Diarrhea and weight gain if fed often
- Sardines in oil: too fatty
- Tomato or spicy sauces: salt, garlic, onion
- Salted sardines: too much sodium
- Raw fresh sardines: parasites and bacteria
Your cat ate some: what now?
If your cat ate a whole sardine, even in oil, the worst is usually soft stools: watch for 24 to 48 hours. Call your vet for repeated vomiting, heavy diarrhea or lethargy, or if they ate a whole can of sardines in sauce.
Better options
A bit of plain cooked salmon or chicken, or a fish-flavored cat treat, works well too.
Common questions
Can cats eat sardines in olive oil?
Drained, a small bite is fine, but the oil adds a lot of fat and calories. If you have the choice, pick sardines packed in water with no added salt.
Can cats eat sardines every day?
No. Even in water, they're oily, high in calories and don't cover a cat's needs. Once a week as a treat is plenty.
This information is general and does not replace advice from a veterinarian. If your cat has swallowed something toxic, call your vet or an animal poison control center right away, without waiting for symptoms.