Before the first bowl

Ten foods that are dangerous for dogs, how to switch from kibble without a week of diarrhea, and the signs that mean stop cooking and call the vet.

Foods that can hurt or kill a dog

Not a complete list, and not a reason to panic. It is a reason to keep these out of reach and to call poison control rather than wait for symptoms.

Chocolate

Theobromine and caffeine, both methylxanthines. Dark chocolate and baking chocolate are far more dangerous than milk chocolate; white chocolate is mostly fat and sugar with almost no theobromine. Signs start with vomiting and restlessness, then a racing heart, tremors and seizures. A dog that ate a bar of dark chocolate needs a call, not a wait-and-see.

Xylitol

The most dangerous item on this page, and the least obvious. Xylitol is a sweetener in sugar-free gum, some peanut butters, sugar-free baked goods, mints and even some toothpastes. In dogs it triggers a massive insulin release — blood sugar crashes within 30 to 60 minutes — and at higher doses it causes liver failure. The dangerous dose for hypoglycemia is around 0.1 g per kg of body weight, which means one or two pieces of gum can be enough for a small dog. Read the label on the peanut butter before it goes in a Kong.

Grapes and raisins

Acute kidney injury. There is no established safe dose and no reliable pattern: some dogs eat a handful and are fine, others go into kidney failure from a few raisins. Because the reaction is unpredictable, any ingestion is treated as an emergency.

Onions, garlic, leeks, chives

Allium species damage red blood cells and cause hemolytic anemia. It is cumulative, so a small amount every day is worse than the same amount once. Garlic is roughly five times more concentrated than onion, and powdered garlic in a stew is the classic accident. Symptoms can take days to appear: weakness, pale gums, dark urine.

Macadamia nuts

Weakness, tremors, wobbling, sometimes a raised body temperature. Usually survivable with supportive care, always worth a call.

Alcohol and raw yeast dough

Bread dough rising in a dog's stomach produces ethanol and expands at the same time — intoxication and a distended stomach together. Both are emergencies.

Caffeine

Coffee grounds, tea bags, energy drinks and caffeine pills. Same methylxanthine family as chocolate, so the same effects at a much smaller dose.

Cooked bones

Cooked bone splinters into sharp pieces that can perforate the gut. Raw bone is a separate argument with its own risks, but cooked bone is not an argument at all: it goes in the trash, not the bowl.

High-fat food and the trash can

Pancreatitis is the most common serious consequence of a stolen meal. Bacon grease, fatty trimmings, butter, fried food. The dog looks fine for 12 to 24 hours, then starts vomiting, hunches, and refuses food.

Moldy food

Moldy bread, cheese or compost can carry tremorgenic mycotoxins that cause violent tremors and seizures within hours. Keep compost closed.

Switch from kibble over ten days

A sudden change to home-cooked food produces diarrhea in most dogs, not because the food is bad but because the gut bacteria are being replaced overnight. Slow works better than dramatic.

If stools loosen at any step, hold at that ratio for two extra days before going further.

Feeding and storing safely

• Cooked home diets are a food safety exercise. Wash hands and boards, keep raw meat away from the finished food, and refrigerate within two hours of cooking.
• Fridge life is three to four days. Freezer life is about three months, portioned before freezing so you defrost a single day at a time.
• Thaw in the fridge, not on the counter. Do not microwave until the food is hot — dogs cannot taste a burn coming, but their mouths still feel it.
• Wash the bowl after every meal. Cooked food sticks and bacteria multiply faster than on kibble.
• Do not leave food out for free feeding. A home diet has no preserved shelf life at room temperature.

When to stop and call the vet

• Vomiting more than three times in a day, or any vomiting for more than 24 hours
• Blood in stool, black tar-like stool, or diarrhea lasting more than 48 hours
• Refusal to eat for more than 24 hours, or sudden refusal on a diet the dog accepted yesterday
• A hard, distended or painful abdomen — bloat is a surgical emergency and time matters
• Weakness, collapse, pale or yellow gums
• Any suspected ingestion from the list above, even if the dog looks normal