My Russian Blue, Misha, figured out how to open the kitchen bin about six months ago. The first time it happened, I walked in to find her face-deep in eggshell remnants from that morning’s breakfast. Cue the frantic Google search at 7am: “are eggs toxic to cats?”
They’re not. Cooked eggs are perfectly safe for cats and actually make a pretty solid treat. Raw eggs are a different story though — and that’s where most of the confusion comes from.
Why cats and eggs actually make sense
Cats are obligate carnivores. Their entire digestive system is built around processing animal protein. Eggs are almost pure animal protein — about 13g per 100g, with all the essential amino acids cats need, including taurine (though not in huge amounts).
One large egg contains roughly:
- 70 calories
- 6g protein
- 5g fat
- Vitamin A, B12, D, and E
- Iron, selenium, and riboflavin
For context, the average 4kg indoor cat needs about 200 calories per day. A single egg is more than a third of that. So while eggs are nutritionally solid, they’re calorie-dense relative to a cat’s tiny daily budget.
Cooked vs raw — this part matters
Cooked eggs: safe. Scrambled, hard-boiled, poached — all fine as long as you skip the butter, oil, salt, and seasoning. Plain is the only option here. Boring for you, ideal for your cat.
Raw eggs: skip them. Two reasons:
- Salmonella and E. coli. The same bacteria risk that applies to humans applies to cats. Yes, cats have shorter digestive tracts and more acidic stomachs, which offers some protection. But “some protection” is not the same as immunity. The American Veterinary Medical Association explicitly discourages raw animal proteins in pet diets.
- Avidin in raw egg whites. Avidin is a protein that binds to biotin (vitamin B7) and blocks its absorption. Over time, regular raw egg white consumption can lead to biotin deficiency — dull coat, skin problems, lethargy. Cooking denatures avidin completely, which is why cooked eggs don’t have this issue.
How much egg can a cat have?
The 10% rule applies to cats too: treats and extras should be no more than 10% of daily calories. For a typical 4kg cat eating 200 calories a day, that’s 20 calories from treats — roughly one-third of a large egg, or about one tablespoon of scrambled egg.
That’s not much. Cats are small animals with small caloric needs, and it’s easy to overshoot.
Best ways to prepare eggs for your cat
Scrambled (no butter/oil): Use a non-stick pan on low heat. No salt, no pepper, no milk. Just egg. Break it into small pieces once cooked. This is the easiest prep method and most cats seem to prefer the texture.
Hard-boiled: Boil, cool, peel, chop into tiny cubes. Keeps well in the fridge for a couple of days if you want to prep ahead. Good option for mixing into regular food.
Poached: Works fine. Just make sure it’s fully cooked through — no runny yolk for cats.
One thing to avoid: fried eggs. The oil adds unnecessary fat and calories. If the pan needs oil to cook, it’s not the right method for your cat’s portion.
Eggs compared to other cat-safe protein treats
| Eggs | Tuna | Chicken | Salmon | |
|---|---|---|---|---|
| Calories/100g | 155 | 132 | 165 | 208 |
| Protein/100g | 13g | 28g | 31g | 20g |
| Safety Score | 8/10 | 6/10 | 9/10 | 7/10 |
| Best for | Quick treat, variety | Picky eaters | Protein boost | Omega-3 |
| Watch out for | Overcaloric | Mercury, sodium | Bones, seasoning | Mercury, bones |
Chicken wins overall on protein-per-calorie and safety. But eggs are the most convenient — crack, scramble, done in two minutes. Tuna scores lower because of mercury concerns with frequent feeding.
When to skip eggs
Overweight cats. At 70 calories per egg, it’s easy to push an already chubby cat further into weight gain territory. If your cat needs to lose weight, there are lower-calorie treat options (plain cooked chicken breast is leaner).
Cats with kidney disease. Eggs are moderately high in phosphorus. Cats with chronic kidney disease often need phosphorus-restricted diets. Ask your vet before adding eggs.
Cats with food allergies. Egg is one of the more common food allergens in cats (though still relatively rare overall). If your cat has known food sensitivities, introduce egg slowly — a tiny amount first, then wait 24-48 hours and watch for itching, vomiting, or diarrhea.
Frequently asked questions
Can kittens eat eggs?
Yes, from about 12 weeks old. Start with a very small amount — maybe half a teaspoon of scrambled egg. Kittens have even smaller caloric needs than adult cats, so portions should be tiny. Make sure the egg is fully cooked and plain.
Can cats eat egg yolk only?
Yes. The yolk contains most of the fat, calories, and fat-soluble vitamins (A, D, E). It’s nutritionally denser than the white. Some cat owners give just a small amount of cooked yolk as a treat. Just remember that yolk is about 55 calories on its own — more than a quarter of most indoor cats’ daily treat allowance.
How often can I give my cat egg?
Once or twice a week is reasonable. Daily egg on top of regular cat food would likely push calorie intake too high for most cats. Treat it as an occasional thing, not a staple.
My cat ate raw egg — should I worry?
One exposure is unlikely to cause problems. Watch for vomiting, diarrhea, or lethargy over the next 24-48 hours. The risks with raw egg (salmonella, biotin depletion) are more about repeated exposure than a single incident. If your cat seems fine after a day, they’re fine.
Can cats eat eggshell?
Technically yes — ground eggshell is sometimes used as a calcium supplement in homemade cat food recipes. But don’t just toss your cat a chunk of eggshell. It needs to be finely ground to a powder to be digestible and to avoid sharp edges. For most cat owners, this isn’t worth the effort when commercial cat food already provides adequate calcium.
