Fish is a great source of protein, but there are a few reasons why a steady diet of human-grade canned tuna can cause health problems for your cat. Even if you can keep your cat and dog on a cordial basis, the litter box is a whole other ballpark. Modern day cats, however, have developed a taste for fish. Though tuna and salmon are both excellent sources of protein for cats, the type of canned fish intended for human consumption is generally not the best choice to feed your cat. Also, carnivorous fish such as tuna and salmon contain higher levels of mercury, which is dangerous to your cat if it accumulates in the system. Cats love seafood, and most cats are especially fond of canned tuna and tuna juice. Cats should never eat raw fish. Not recommended! My Siamese tom cat, Andy, was one of the few that did not like fish. However, it can provide a tasty change of pace to delight your house cat's palate. But fish isn’t always an optimal food for cats. Cats love fish so you won’t have to force them to eat it. While tuna is fine for cats in moderation or as a treat, too much canned tuna can be bad for your cat. Smaller fish like cod, halibut and flounder are safer for cats to eat because their flesh contains less mercury. ).Here’s why: Because it is simply not safe to feed fish to cats (and humans should be very careful about eating it themselves, and especially about feeding it to their children! Go with brands that are known for quality, or better yet, human-grade ingredients. We’ll detail some of the best ways to keep your puppy away from the litter box. A cat and a fish by Shutterstock And if your finicky feline insists on a surf-and-turf diet, choose carefully. A lot of cats have learned to love fish, but it’s not a natural feline food; and it’s really not a good idea to feed it to your cat.Why not? Canned fish has much higher sodium content than cat food, so it should be fed sparingly. However, it’s important to carefully choose what type of fish you feed him: it’s better to choose a “fat” type of fish like tuna, salmon, or mackerel because it contains a fatty acid that your cat cannot produce by himself (fish … When cats eat a diet that consists primarily of raw fish (not commercially prepared foods that contain fish), they are at risk for developing thiamine deficiency. A lack of thiamine can cause serious neurological problems and … Symptoms include a loss of … Small cats eat almost no fish in the wild. Not all species of fish are equally healthy for cats, however. Keeping dogs and cats in harmony has never been an easy task. Canned fish tends to be very high in sodium and oil-packed varieties will be too high in fat for your cat. Can My Cat Eat Canned Fish? Raw meat and raw fish, like raw eggs, can contain bacteria that cause food poisoning. 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