Can Cats Eat Crab? Real Crab, Imitation Crab and Shellfish Allergies

By Tailwisp Editorial TeamUpdated October 20, 20264 min read

Seafood smells irresistible to cats, and a dropped piece of crab may vanish in a flash. Plain crab meat is a fairly safe treat, but a number of preparations and products are not. Here is what to know before sharing.

Nutrition in crab

Crab meat is a lean source of protein, with B12, zinc, selenium, copper and omega-3 fatty acids. Cats do need animal protein. But crab is also relatively high in sodium and cholesterol, and it does not provide a balanced diet. Crab meat is a treat, not a substitute for cat food. See how to read a cat food label.

How to serve real crab

• Cooked thoroughly, with no raw parts.
• Plain. No salt, butter, oil, garlic, onion, lemon, spices or sauces. See are onions and garlic toxic to cats.
• Shell removed completely, including small fragments.
• Small amount: a teaspoon of flaked meat is enough.
• Occasionally, not daily.
• Cooled, and fresh.

Imitation crab

Imitation crab, sometimes called surimi or crab sticks, is made from fish paste, starch, sugar, salt, egg white and flavorings, with food coloring. It contains little real crab, and the sodium and additives make it a poor treat. Some products contain garlic or onion powder. A tiny piece will not poison a cat, but it is better to avoid regular feeding. See can cats eat tuna for general fish guidance.

Risks

• Raw shellfish. Can carry bacteria, parasites and thiaminase, an enzyme that destroys thiamine, vitamin B1. Thiamine deficiency can cause neurological signs. Cook all shellfish.
• Salt. Excess sodium is a risk for cats with kidney or heart disease. See chronic kidney disease in cats.
• Allergies. Shellfish is a common allergen. Signs include itching, hives, facial swelling, vomiting and diarrhea. Facial swelling and trouble breathing are emergencies.
• Shells. Sharp edges can cut the mouth and throat, or cause blockages.
• Seasoned dishes, such as crab cakes, dips, bisque and boils, which contain onions, garlic, butter, breadcrumbs and spices.
• Heavy metals and contaminants, in some seafood. Offer variety, and sensible amounts.
• Purines and cholesterol, which matter in some diseases.

Which cats should avoid crab

• Cats with kidney disease, heart disease or high blood pressure.
• Cats with pancreatitis, or on low-fat diets. See pancreatitis in cats.
• Cats with seafood or fish allergies. See cat food allergies and sensitive stomachs.
• Cats on a prescription diet.
• Overweight cats.

Signs of trouble

Vomiting, diarrhea, itching, swelling, lethargy or trouble breathing after eating crab should be taken seriously. Call your vet. If your cat swallowed shell and seems distressed, go to a clinic.

Other seafood

See can cats eat shrimp, can cats eat salmon and can cats eat sardines.

Crab and kidney or heart diets

For cats on a restricted sodium or phosphorus diet, even a small amount of shellfish can matter. Crab is relatively high in both. If your cat has kidney disease, ask your vet before offering any seafood. Treats that are suitable for healthy cats may be unsuitable for them. See cat kidney disease stages.

Other shellfish

Cooked shrimp is similar in risk and benefit to crab. Raw oysters, clams and mussels carry bacteria and toxins and should not be fed. Fish such as salmon and sardines are more common treat choices, with a better nutrient profile when cooked and plain. See can cats eat shrimp.

Crab-flavored cat foods

Some cat foods contain crab or crab flavor. These are formulated to be complete and balanced, with controlled sodium. They are different from sharing human seafood. Check labels and look for "complete and balanced". See how to read a cat food label.

Preventing food theft

Cats are masters of stealing seafood. Keep plates away from the edge of the counter, and cover leftovers. A cat that learns that crab is available will keep trying. Train a safe alternative, such as a treat in a favorite spot. See how to keep a cat off kitchen counters.

Quick checklist before you share

Real crab, cooked, plain and shell-free. A teaspoon at most. Not for cats with kidney or heart disease, or seafood allergies. Skip imitation crab, crab dip and crab cakes. If your cat shows itching, swelling or digestive upset afterward, call your vet.

When to see a vet

See a vet if your cat shows signs of allergy or digestive upset. Use the US vet directory to find a clinic.

This article is general educational information, not veterinary advice. Every cat is different. If your cat is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.