Can Kittens Have Tuna? What Vets Advise for Growing Cats

Can kittens have tuna? A tiny taste is unlikely to cause harm, but most vets advise skipping tuna in the first year. Kittens need a complete growth diet, and tuna is not complete.

This guide answers the question can kittens have tuna with real sources. You will learn the risks, the treat limit for kittens, and what to feed a growing cat instead.

Can kittens have tuna? The short answer

Most kittens love the smell of tuna, so owners often ask can kittens have tuna. So it is natural to wonder whether a spoonful is a safe treat.

The cautious answer is no, at least for now. A veterinarian writing for PetMD says that kittens should not eat tuna. The article suggests waiting until your cat is at least 1 year old before you offer treats like tuna.

There are three main reasons why vets say no when owners ask can kittens have tuna. First, kittens need a complete growth diet. Second, tuna lacks key nutrients, such as enough vitamin E. Third, tuna can carry mercury, and small, fast-growing bodies may be more sensitive to toxins.

That said, if your kitten steals a lick of tuna water, there is no need to panic. The concern is regular feeding, not one tiny taste. If you want to know about adult cats, read our guide on can cats eat tuna.

Why can kittens have tuna only rarely? They need a growth diet

Kittens grow fast, so they need the right nutrients in the right ratios. According to AAFCO, the nutritional adequacy statement is perhaps the most important part of a pet food label.

AAFCO explains that complete means the food contains all the nutrients required. Balanced means those nutrients are present in the correct ratios. Life stages matter too, and AAFCO lists growth and all life stages among them.

The Pet Food Institute adds that the growth stage includes kittens. So a kitten food should say it is complete and balanced for growth or for all life stages.

VCA Animal Hospitals gives the same advice. It tells owners to look for the AAFCO statement for growth or all life stages, and not to add vitamins or minerals without asking a vet.

Plain tuna has none of that, so can kittens have tuna as a meal? No. It is a single food, not a complete diet. In other words, every bite of tuna replaces a bite of food that a kitten really needs.

Can kittens have tuna safely? The main risks

This table sums up the main concerns when people ask can kittens have tuna. Each one comes from a vet or government source.

As you can see, the risks add up when tuna becomes a habit. Let us look at the biggest ones in more detail.

Vitamin E and steatitis

The MSD Veterinary Manual notes that vitamin E deficiency has occurred in cats fed large amounts of canned tuna. This can cause pansteatitis, also called yellow fat disease.

Also, a case report in Acta Veterinaria Scandinavica explains that pansteatitis in cats results from vitamin E deficiency. It is painful, so it is worth avoiding.

Mercury in tuna

Tuna can carry mercury, which is another reason to pause before asking can kittens have tuna. In FDA testing, canned light tuna averaged 0.126 ppm of mercury. Canned albacore averaged 0.350 ppm, which is almost three times higher.

Pet foods can carry mercury too, especially fish-based foods. A study summarized by dvm360 tested 101 cat and dog foods. Among the foods with the highest mercury levels, fish was the first ingredient in every one.

Salt and oil

Some canned tuna is salty, so can kittens have tuna from a can? Not regularly. The USDA sodium table lists 337 mg of sodium in 3 oz of white tuna canned in oil. The ASPCA warns that too much salt can cause thirst, vomiting and other signs.

Can kittens have tuna as a treat? The treat limit

Even safe treats need a limit, and this matters when you ask can kittens have tuna. The ASPCA advises that treats should make up no more than 5% of your kitten's daily intake.

For adult cats, the limit is a little higher. The WSAVA treat guide says treats should make up no more than 10% of a cat's daily calories. The AAHA nutrition guidelines also set complete food at 90% or more of the diet.

Now look at tuna, because the numbers answer can kittens have tuna for you. WSAVA lists canned tuna in water at about 36 kcal per ounce. For a small kitten, that can use up the whole treat budget, or more. So even when people ask can kittens have tuna as a small treat, the numbers rarely work.

Can kittens have tuna raw or cooked?

Raw fish brings extra risks, so can kittens have tuna raw? Please do not offer it. The MSD Veterinary Manual explains that thiaminases occur in raw freshwater fish and clams. These enzymes break down thiamine, a B vitamin that cats need.

However, cooking destroys thiaminases, and canning uses heat. So the thiamine risk mostly applies to raw fish, not to canned tuna. Still, the other tuna risks remain.

If you ever offer tuna to an adult cat, PetMD advises tuna packed in water, not oil, with no spices or flavors. For fresh tuna, it advises cooking without butter, oil or spices.

When can kittens have tuna? Age and weaning

Kittens move to solid food in stages, which shapes when kittens can have tuna. The ASPCA notes that weaning normally begins at about four weeks. By five to six weeks, kittens should nibble kitten food consistently.

VCA adds that kittens are typically fully weaned at about 8 weeks. It suggests three to four small meals or more each day for growing kittens.

The ASPCA also says a kitten should eat kitten formula food until about one year of age. That is why many vets give the same answer when owners ask can kittens have tuna: wait until your cat is an adult.

Kitten feeding basics before you ask can kittens have tuna

Before you think about extras, get the basics right. First, pick a kitten food that says complete and balanced for growth or for all life stages. Next, follow the feeding guide on the label, and adjust it with your vet as your kitten grows.

Meal timing matters too. VCA suggests three to four small meals or more each day for growing kittens, since their stomachs are small. Fresh water should always be available.

Weigh your kitten every week or two if you can. Steady growth is a good sign that the diet works. If growth stalls, or your kitten seems hungry all the time, then ask your vet before you change anything.

Once these basics are in place, the question can kittens have tuna becomes much less urgent. A well-fed kitten does not need tuna at all.

Can kittens have tuna without side effects? Signs to watch

If your kitten has already eaten some tuna, stay calm. In most cases, a small taste causes no problem at all.

Still, watch your kitten for a day or two. Call your vet if you notice vomiting, diarrhea, a loss of appetite or unusual tiredness. Also call if your kitten ate tuna with onion, garlic or heavy salt, such as tuna salad, because those extras can be risky.

If your kitten begs for tuna every day, that is a sign to stop offering it. Kittens learn fast, and a picky eater can be hard to fix later. So the answer to can kittens have tuna every day is a clear no.

What to do if you want to give tuna anyway

1. Wait until your cat is about one year old, as PetMD suggests.
2. Check with your vet, especially if your cat has a health problem.
3. Choose canned light tuna in water with no salt, spices or oil.
4. Limit it to a tiny portion, well within the treat budget.
5. Watch for vomiting, diarrhea or a sudden change in appetite.

For adult cats, PetMD suggests no more than 1 tablespoon of plain, cooked, human-grade tuna once a week. If you want to know about tuna mixed with mayo or onions, see our guide to tuna salad for cats.

Better treats than tuna for kittens

There are easier ways to spoil a kitten than asking can kittens have tuna. For example, a few pieces of the kitten's own wet food make a good reward. Play and attention count as rewards too.

If you want a meaty treat, then choose one made for kittens. Read the label, since AAFCO notes that treats often say they are for intermittent or supplementary feeding only.

Many owners also ask about supplements for kittens. Our guides to taurine for kittens and omega-3 for kittens explain what growth foods already supply. As VCA advises, talk with your vet before you add anything.

Can kittens have tuna once they grow up?

Once your cat is an adult, the question can kittens have tuna changes. Then a small amount of plain tuna now and then is a different story. Still, keep it rare, and choose canned light tuna over albacore because of mercury.

However, adult cats that eat a lot of tuna can still develop vitamin E problems. Also, the Cornell Feline Health Center warns that some cats fed canned fish meant for people developed serious neurologic problems. So treat tuna as an occasional extra, not a meal.

Researchers have also looked at fish-flavored foods and thyroid disease in older cats. A dvm360 review of hyperthyroidism studies describes a link between the disease and cats that preferred fish or liver flavors of canned food. However, this is an association, not proof of cause, and up to 25% of cats with the disease had never eaten canned food.

In short, tuna is best as a rare extra at any age. Your vet can help you decide what fits your cat's health and life stage.

If your cat needs more taurine or omega-3, a balanced food is the first step. For adult cats, Kittysum Taurine and Kittysum Omega-3 are daily nutrition support powders. They are not meant for kittens on a complete growth diet unless your vet advises them.

Myths about whether kittens can have tuna

• Myth: cats are meat eaters, so tuna is ideal. Cats are obligate carnivores, as Cornell notes, but that does not make tuna a complete diet.
• Myth: tuna is complete protein, so it is enough. Kittens need many nutrients in the right ratios, which tuna alone does not supply.
• Myth: tuna water is harmless. It can hold salt and still adds calories, so keep it rare.
• Myth: albacore is the best tuna. FDA data show albacore holds almost three times more mercury than canned light tuna.

So, can kittens have tuna? The kindest answer is to wait. Feed a complete growth diet now, and talk with your vet before adding any people food.

Key Terms

• Complete and balanced: a food with all required nutrients in the correct ratios, as AAFCO defines it.
• Growth diet: a food formulated for kittens, labeled for growth or for all life stages.
• Steatitis: painful inflammation of body fat, linked to vitamin E deficiency in cats.
• Thiaminase: an enzyme in some raw fish that breaks down thiamine and that cooking destroys.
• Treat budget: the share of daily calories that can come from treats, about 5% for kittens per ASPCA.