Caring for a cat means being aware of the foods that may pose a risk to their health. While many cat owners are aware that some foods are harmful to dogs, fewer realise that several everyday foods can be equally or more dangerous to cats. Since cats are obligate carnivores with a unique metabolism, certain substances that are harmless to humans or even dogs can cause serious harm to felines. Here is a guide to the most important foods and substances to keep away from your cat.
All members of the Allium family, including onions, garlic, chives, leeks, and shallots, are toxic to cats. These foods contain compounds called thiosulphates and disulphides, which can damage red blood cells and cause haemolytic anaemia. Cats are particularly sensitive to these compounds. Toxicity can occur from raw, cooked, or powdered forms, so even garlic powder or onion powder in food should be avoided. Signs of Allium toxicity include vomiting, diarrhoea, lethargy, pale or yellowish gums, and weakness.
Grapes and raisins are known to cause acute kidney failure in cats and dogs, though the exact toxic compound has not yet been definitively identified. Even small amounts have been associated with serious kidney injury. These fruits should never be given to cats and should be stored out of reach. Signs of toxicity include vomiting, lethargy, loss of appetite, and reduced urination.
Chocolate contains theobromine and caffeine, both of which are toxic to cats. Dark chocolate and cooking chocolate contain the highest concentrations. Even small amounts can cause rapid heart rate, tremors, seizures, and potentially death. Caffeine in any form, including coffee, tea, and energy drinks, poses a similar risk.
Xylitol is an artificial sweetener found in some sugar-free products, certain peanut butters, chewing gum, and some medications. While its effects in cats are less well-documented than in dogs, it is considered potentially toxic and should be avoided. Keep any xylitol-containing products safely away from cats.
Even very small amounts of alcohol can cause serious harm to cats, including vomiting, disorientation, breathing difficulties, and potentially fatal outcomes. Cats should never be exposed to alcoholic drinks or foods containing alcohol.
Unbaked yeast dough can expand in a cat’s stomach, causing pain and bloating. As the yeast ferments, it produces alcohol, which can cause ethanol toxicity. Both the expansion and the fermentation process are dangerous, so raw dough should be kept well out of reach.
While cats are carnivores and can benefit from appropriately prepared meat in their diet, raw fish fed regularly can deplete thiamine (vitamin B1), causing neurological problems. Raw meat also carries the risk of bacterial contamination (Salmonella, E. coli, Listeria) and parasites. Properly balanced, commercially prepared raw diets that have been handled safely are different from simply feeding raw meat at home.
Contrary to popular belief, most adult cats are lactose intolerant. Milk and other dairy products can cause digestive upset, including diarrhoea and stomach cramps. Small amounts of hard cheese are generally better tolerated than milk, but dairy is not a necessary or particularly beneficial food for cats and is best avoided.