Cats can have a small amount of fish, but raw minnows are best avoided. Raw freshwater fish may contain thiaminase, an enzyme that breaks down vitamin B1, and raw animal products can carry harmful germs. If you offer fish, choose plain cooked fish, let it cool, remove every bone, and serve it only as an occasional treat. Minnow-specific feeding studies and safe serving sizes have not been established.
Why raw minnows are a concern
Minnows are freshwater fish, and raw freshwater fish can contain thiaminase. The Merck Veterinary Manual explains that thiaminases can rapidly destroy dietary thiamine (vitamin B1); cooking fish destroys the enzyme. The Centers for Disease Control and Prevention (CDC) similarly says, “Cooking breaks down thiaminase, a harmful enzyme, in seafood and prevents thiamine deficiency in cats.”
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Raw animal products can also carry pathogens. The CDC notes that raw pet food may contain germs such as Salmonella and Listeria. Freezing, freeze-drying, and dehydrating reduce germs but do not kill all of them. Cornell’s Feline Health Center also advises against feeding raw meat because of infection risks, including toxoplasmosis.
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Which kind of minnow or fish is the safer choice?
| Choice | What to know | Practical guidance |
|---|---|---|
| Raw minnows | Raw freshwater fish may contain thiaminase, and raw animal products can carry pathogens. | Avoid feeding them raw. |
| Plain cooked fish | Cooking destroys thiaminase, but bones can still injure or obstruct the digestive tract. | If offered, serve cooled, plain, boneless pieces as an occasional treat. |
| Freeze-dried minnow treats | Freeze-drying does not kill all germs if the product is raw; processing and labeling vary. | Check the current package and follow its instructions. Do not assume freeze-dried means germ-free. |
| Complete commercial cat food | Commercial diets are developed to provide balanced nutrition and calories. | Keep a complete and balanced diet as the cat’s main food. |
Remove bones and keep portions small
Bones can lodge in a pet’s esophagus, stomach, or intestines and cause an obstruction, according to the U.S. Food and Drug Administration. The World Small Animal Veterinary Association (WSAVA) Nutrition Committee’s 2025 guide also warns that bones can cause significant damage if chewed or swallowed. The available guidance does not establish that small minnow bones are harmless, so remove bones thoroughly rather than relying on their size.
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WSAVA recommends that treats make up no more than 10% of a cat’s daily calorie intake. Treats are supplemental, not a substitute for the cat’s regular complete and balanced food. Ask your veterinarian how treats fit your individual cat’s diet and health needs.
How to offer fish cautiously
- Choose plain fish with no seasoning, sauce, or added ingredients.
- Cook it thoroughly and allow it to cool.
- Check carefully for bones and remove them.
- Offer only a small piece occasionally, keeping all treats within the daily calorie limit recommended by your veterinarian.
- Stop offering it if your cat has an adverse reaction, and contact your veterinarian if you are concerned.
There is no established minnow-specific safe serving size in the available veterinary guidance. Treat cooked minnow like any other occasional fish treat, not a meal or a replacement for balanced cat food.
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What the evidence does—and does not—establish
Veterinary and public-health guidance addresses raw freshwater fish, seafood, raw pet food, bones, and treats generally; it does not establish that minnows are categorically toxic. Nor does it provide a minnow-specific feeding trial, serving size, or proof that a particular minnow product is risk-free. A specific product’s present processing method cannot be inferred from its category, so check its current packaging.
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