Can Cats Eat Eggs? Yes, and Here Is Exactly How Much

Yes, if it is plain and fully cooked, and if it is small.

Almost every page answering this question stops at "yes, in moderation", which is not an answer. So here is the number, and the arithmetic behind it, because that part is missing everywhere.

The short version

• Plain cooked egg: fine as an occasional treat. Boiled, poached or scrambled with nothing added.
• Plain means plain. No butter, no oil, no salt, no milk (whether cats can drink milk is the breakfast table's other question), no cheese, and above all no onion or garlic, which are genuinely toxic to cats even in the powdered amounts a recipe uses.
• Raw: no. For two separate reasons that are usually mashed into one, and should not be.
• The portion is smaller than you think.

The portion, and the arithmetic

Nobody publishes this, so we did it from cited inputs and we are showing the working.

A cat's daily calorie need is calculated from its body weight using the standard veterinary formula, adjusted for whether it is neutered. Treats should stay at or under 10 percent of that daily total, which is the guideline institutions actually give. And a large egg is about 72 calories, from the USDA's own food database.

Run that for an average 10 lb (4.5 kg) neutered adult cat and you land here:

⚠️ That is a derived figure, not a quote. We built it from the veterinary energy formula, the 10 percent treat guideline and the USDA calorie count, all cited below. No single institution publishes "one tablespoon" as an official number, and we are not going to pretend otherwise.

For a lighter or heavier cat, the principle is what travels: the egg has to fit inside a tenth of that particular cat's daily calories, alongside every other treat it gets.

The taurine claim, corrected

Several pages lean on egg's "complete amino acid profile" in a way that implies it helps with taurine, the one amino acid cats cannot make enough of themselves.

It does not, meaningfully. The peer-reviewed survey that measured taurine across animal feed ingredients found the high concentrations in animal muscle, above all marine: that is where taurine lives. Published measurements for egg itself disagree with one another, which is exactly why no careful feeding plan counts on egg for taurine.

Egg is a genuinely good protein. It is not a taurine supplement, and a page implying otherwise is overselling it.

Raw egg: two different risks, and they need separating

Risk one, avidin and biotin. Raw egg white contains avidin, which binds biotin and blocks its absorption. This is real: controlled feeding trials produced biotin deficiency in kittens.

But look at the exposure those trials used. Raw egg white made up 18.5 to 32 percent of the entire diet, for 12 to 25 weeks straight. That is not an occasional teaspoon, and naturally occurring biotin deficiency in cats is considered rare in ordinary circumstances.

So the avidin story is true and routinely oversold. Say it accurately or do not say it.

Risk two, pathogens. This one is not oversold. Raw or undercooked egg can carry Salmonella and Campylobacter, and the risk runs in both directions: a cat can be made ill, and a household can be infected from a cat that is shedding.

That is the reason to cook it. Not the avidin.

Eggshells as a calcium source

A popular idea, and the answer is more interesting than yes or no.

Eggshell is largely calcium carbonate, so it genuinely contains calcium. The problem is not the calcium, it is the balance: a cat's diet needs calcium and phosphorus in a particular ratio, and adding a single mineral to a complete food is how you break a ratio that was already correct.

If a cat is eating a complete commercial food, it does not need added calcium, and adding it is more likely to cause a problem than solve one.

Who should not have egg at all

• A cat on a prescription renal diet. A high-protein treat is not neutral for a cat whose diet has been formulated around restricting phosphorus. Ask the vet who prescribed it.
• A cat with a diagnosed food allergy, until you know what it reacts to. Egg allergy in cats exists, but it is rare: across the published literature only one cat in 78 reacted to egg.
• Kittens on a growth diet, for the same reason as the renal case: their food is balanced and treats displace it.

If your cat ate a raw egg

Most likely nothing happens. What to watch for is vomiting, diarrhea, or a cat that goes off its food, in the day or two afterwards.

If your cat stops eating, that is its own clock and a short one, so call your vet. Anything that worries you about your cat is a reason to call, and out of hours, an emergency clinic. Nothing on this page is ever a reason to wait.

What to take away

• Plain cooked egg, yes. Anything added to it, no.
• About a tablespoon for a 10 lb cat as an everyday ceiling. A whole egg is roughly triple that.
• Egg is a good protein and not a taurine plan. Do not confuse the two.
• Raw egg carries two separate risks. The pathogen one is the serious one; the avidin one is real but consistently overstated.
• Eggshell adds calcium to a food whose mineral balance is already right. Leave it out.
• Renal diets, growth diets and known allergies are conversations with your vet, not with a recipe page.

Related, and a genuine surprise: a cat cannot taste sweetness at all, which changes what "a treat" even means to them.