By Charles Jason
If your cat sneaks a few bites from the dog's bowl, there is no need to panic. Dog food is not toxic to cats. The problem is what happens when a cat eats it regularly. Cats and dogs have very different bodies, and dog food is not built to keep a cat healthy.
Why cats need different food than dogs
Cats are obligate carnivores. That means their bodies are built to get nutrients from animal tissue, and they cannot make some important nutrients from plants. Dogs are more flexible eaters and can make some of these nutrients themselves.
Here are the key differences:
| Nutrient | Why cats need it | The dog food problem |
|---|---|---|
| Protein | Cats need more protein than dogs and use it for energy | Dog food usually has less protein than a cat needs |
| Taurine | Heart health, vision, reproduction | Dogs make their own, so dog food may not add enough for a cat |
| Arachidonic acid | Skin, coat, and normal body functions | Dogs make it from other fats, cats cannot |
| Vitamin A | Vision, skin, immune system | Cats cannot turn beta carotene from plants into vitamin A, they need it ready made |
| Niacin (vitamin B3) | Energy use | Cats need more than dogs and must get it from food |
What can happen if a cat eats dog food long term
Problems build slowly, over weeks to months, which is why they are easy to miss.
- Heart disease. Low taurine can cause dilated cardiomyopathy, where the heart muscle becomes thin and weak.
- Vision loss. Low taurine can damage the retina, the light sensing layer at the back of the eye. This damage can be permanent.
- Muscle loss and poor coat. Not enough protein and fatty acids can lead to weight loss, a dull coat, and skin problems.
- General poor health. Missing vitamins can affect the immune system and energy.
A cat food label that says "complete and balanced" for cats is the simplest way to know your cat is getting what it needs.
What if my cat only eats a little?
| Situation | Risk |
|---|---|
| A few bites from the dog's bowl now and then | Very low for a healthy cat |
| One day of dog food because you ran out | Low for a healthy adult cat |
| Dog food mixed into meals every day | Not safe over time |
| Dog food as the only diet | Not safe |
If your cat has vomiting or diarrhea after eating dog food, offer its normal food and fresh water, and call your vet if the problem lasts more than a day or your cat stops eating. Cats that stop eating can get sick quickly, so read our guide on when to worry about a cat not eating.
Can cats eat dog treats?
An occasional dog treat is usually fine for a healthy cat, but check the ingredients first. Avoid any treat with garlic, onion powder, or xylitol, and keep treats small. A cat's daily treats should be only a small share of its food.
How to stop your cat eating the dog's food
Food stealing is very common in homes with both pets. These steps help:
- Feed at set times instead of leaving food out all day. Pick up the dog's bowl when the meal is over.
- Feed in separate rooms, or close a door during meals.
- Feed the cat up high. Most cats can jump to a counter or shelf where dogs cannot reach.
- Use a microchip feeder. These bowls open only for the pet wearing the matching tag or microchip.
- Use a baby gate with a cat sized gap, or a door strap that leaves a small opening only a cat can fit through.
- Make sure your cat is not hungry. Ask your vet how much to feed, and use measured meals.
Keep the cat's own bowl out of the dog's reach too. Cat food is rich, and dogs that eat a lot of it can get an upset stomach.
What to feed in an emergency
If you run out of cat food and cannot get more right away, plain cooked meat is a better short term option than dog food:
- Plain cooked chicken or turkey, no skin, no bones, no seasoning
- Plain cooked white fish, no bones
These are not complete diets, so only use them for a day while you get proper cat food. Never use onion, garlic, or seasoning, which can harm cats.
How to choose a good cat food
- Look for a statement that the food is complete and balanced for your cat's life stage (kitten, adult, or all life stages).
- Pick a food your cat likes and does well on, with a healthy coat, normal stool, and steady weight.
- Wet food adds water to the diet, which helps many cats. Mixing wet and dry is fine.
- Change foods slowly, over 7 to 10 days.
- Ask your vet about special diets for kidney disease, urinary problems, or weight loss.
The bottom line
A stolen bite of dog food is not an emergency. A diet of dog food is a real health risk. Cats need more protein and specific nutrients that dog food does not reliably supply. Feed each pet its own complete food, and set up meal times so the cat and dog are not sharing bowls.
Frequently asked questions
Can I feed my cat dog food for one day if I run out?
One day of dog food is unlikely to harm a healthy adult cat. Get proper cat food as soon as you can. Plain cooked chicken or turkey with no seasoning is a better short term backup than dog food.
Can dogs eat cat food?
Not as a regular diet either. Cat food is usually higher in fat and protein than dogs need, which can cause stomach upset, weight gain, and in some dogs pancreatitis. An occasional stolen bite is rarely a problem.
What is taurine and why do cats need it?
Taurine is an amino acid that cats need for a healthy heart, good vision, and normal reproduction. Cats cannot make enough of it on their own, so it must come from their food. Cat foods are made with this in mind.
Is there a food both my cat and dog can eat?
No commercial diet is designed to fully meet both species' needs. Feed each pet a complete food made for its own species and life stage.
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