Toxic Foods for Dogs: Beware! These Everyday Foods could be Deadly

As dog parents, we want the absolute best for our furbabies. But did you know that some everyday foods—ones we humans eat without a second thought—can be harmful, or even deadly, to dogs? Yep, that leftover snack you just tossed in your pup’s direction might not be as harmless as you think! So let’s get into a comprehensive list of toxic foods for dogs and break down what to keep out of their bowls to ensure they stay happy, healthy, and tail-wagging for years to come.

Toxic Foods for Dogs (that Harm Your Dog’s Health in the Long Run)

Some toxic foods for dogs don’t immediately show negative effects but can cause long-term health problems. Here are the ones you should eliminate or at least feed in strict moderation:

1. Soy, Corn, and Wheat

These ingredients sneak their way into a lot of commercial dog foods. The problem? They’re common allergens and can cause digestive issues, itchy skin, and even contribute to inflammation. Many dogs thrive on a grain-free or low-grain diet, so it’s best to be cautious.

2. Canola, Safflower, Soybean & Peanut Oil

Highly processed and often derived from genetically modified crops, these oils are loaded with omega-6 fatty acids. While omega-6 is essential in small amounts, excess consumption promotes inflammation, which can lead to diseases like arthritis, obesity, and heart issues. Think of it like feeding your dog junk food every day—no good, right?

3. Used Cooking Oil

Frying oil that’s been reused or left sitting can become rancid, turning into a cancer-promoting nightmare for your pup. If it’s not great for us, it’s definitely not great for them.

4. Sugar

Sugar isn’t just a problem for humans; it’s equally harmful to dogs. It can lead to obesity, diabetes, and even dental problems. If you’re thinking of treating your dog, go for natural options like fresh fruits (but make sure they’re dog-safe!).

5. Salt

Dogs need a bit of sodium in their diet, but too much can be dangerous, leading to dehydration, high blood pressure, and even kidney issues. Keep those salty snacks out of reach!

6. Dairy Products

Lactose intolerance is common in dogs, and dairy can lead to stomach upset, gas, and diarrhoea. Plus, the pasteurization process removes many of the natural enzymes that would have helped with digestion. If your dog loves dairy, small amounts of plain yogurt might be a safer option.

7. Margarine

This processed butter substitute is full of trans fats, which can lead to inflammation and increase the risk of heart disease. Stick to healthier fat sources like coconut oil or fish oil (in moderation, of course!).

8. Pasta & White Rice

Carbs aren’t inherently bad, but white rice and pasta break down into simple sugars, causing blood sugar spikes that can lead to obesity and diabetes. Whole grains (like brown rice or quinoa) are better alternatives if you want to include grains in your dog’s diet.

9. Processed Meats

Hot dogs, deli meats, and other processed meats contain nitrates, preservatives, and excessive salt, all of which can be harmful. If you want to share some meat with your pup, go for plain, unseasoned cooked meats like chicken or turkey.

10. Large Fish Varieties (swordfish, tilefish, king mackerel, albacore tuna fish etc.)

Large fish with a long lifespan tend to accumulate high levels of heavy metals like mercury, which can be toxic over time. If you want to include fish in your dog’s diet, opt for smaller, low-mercury fish like sardines or salmon.

11. Peanut Butter

Dogs love peanut butter, but not all peanut butter is created equal! Many brands contain unhealthy oils, added sugar, and excessive salt. Worse yet, some peanut butters contain xylitol, which is extremely toxic to dogs. If you must give peanut butter, choose an all-natural, unsalted variety.

Toxic Foods for Dogs (that can cause Immediate Harm)

When it comes to this category of toxic foods for dogs, they aren’t just unhealthy—they’re downright dangerous! These ingredients don’t wait to cause long-term health issues—they can trigger immediate and severe reactions. Even small amounts of these foods can lead to vomiting, seizures, organ failure, or worse.

Here are the top offenders to keep far, far away from your pup’s bowl:

1. Apple Cores & Seeds

While the flesh of an apple is safe, the seeds contain cyanide, which is highly toxic to dogs. It’s a small risk but not one worth taking!

2. Alcohol

Even tiny amounts can cause alcohol poisoning in dogs, leading to vomiting, tremors, difficulty breathing, and, in extreme cases, death.

3. Caffeine (Coffee, Tea, Soda)

Dogs process caffeine much slower than humans, meaning even a little bit can cause hyperactivity, heart palpitations, tremors, and seizures. Your morning coffee? Strictly for humans only.

4. Citrus Fruits

Oranges, lemons, and limes contain compounds that can cause stomach upset and vomiting. Grapefruit is particularly toxic and should never be given to dogs.

5. Grapes, Currants & Raisins

The reason why these fruits are so dangerous is still a mystery, but we do know they can cause sudden kidney failure. No amount is safe, so keep them far away.

6. Moldy Food

Moldy leftovers aren’t just gross—they can contain aflatoxins, which can cause severe liver damage. If it’s not good enough for you, it’s definitely not good enough for your dog!

7. Nutmeg

Contains myristicin, which can lead to hallucinations, tremors, and seizures in dogs. Stick to dog-friendly spices like turmeric instead.

8. Macadamia Nuts

Just a few macadamia nuts can cause weakness, vomiting, tremors, and even temporary paralysis. Other nuts aren’t great for dogs either, so it’s best to avoid them altogether.

19. Onions

Found in many household dishes, they contain compounds that destroy red blood cells, leading to anemia. Even onion powder can be dangerous!

10. Raw Potatoes

Uncooked potatoes contain solanine, which is toxic to dogs and can affect their nervous system. Cooked potatoes are safer but should still be given in moderation.

11. Rhubarb

This tart plant isn’t just bad for dogs—it can cause vomiting, diarrhoea, and tremors. Definitely one to avoid.

12. Unbaked Bread Dough

Raw yeast dough can expand inside a dog’s stomach, leading to life-threatening bloating. Plus, the fermentation process creates alcohol, making it doubly dangerous.

13. Xylitol (Artificial Sweetener)

Found in sugar-free gum, candy, and even some peanut butters, xylitol causes a rapid drop in blood sugar, leading to seizures and liver failure. Always check ingredient labels before sharing human food!

14. Chocolate

How could we end without this? This one’s infamous for a reason! Chocolate contains theobromine, which can harm a dog’s heart, nervous system, and kidneys. The darker the chocolate, the more dangerous it is. Even a small piece can spell trouble!

Wrapping it up…

Our dogs rely on us to make the best choices for their health, so knowing what to avoid is just as important as knowing what to feed them. Speaking of what to feed them, should you be interested, check out our blog on the Best Ever Foods you can and must feed your pups to ensure the long, healthy, happy life they deserve!

Got any questions about toxic foods for dogs or dog nutrition in general? Drop them in the comments below—we’re always happy to help!

Srijana Saha

Srijana, founder of Godly Dog, brings 12+ years of experience caring for dogs, including her 6 fur kids: a Labrador, 2 Spitz, and 3 Indie rescues. She has studied natural dog nutrition and behavior to better understand and care for them. A passionate advocate for strays and a dedicated volunteer, she believes dogs embody godliness, inspiring unconditional love and selflessness. Through Godly Dog, she shares practical advice to ensure every dog gets the love, care, and respect they deserve.