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10 Ingredients You NEVER Want To See In Your Dog’s Food

By: Adri Sandoval
Adri Sandoval is the Special Projects Manager for iHeartDogs and iHeartCats. Her work has deepened her love for animals, fostering a strong passion for rescue and animal advocacy.Read more
| January 28, 2025

As devoted dog parents, keeping our furry friends healthy and happy is always a top priority. With countless dog food options lining the shelves, it can feel overwhelming trying to pick the best one for your pup. While every dog has unique dietary needs, there are certain ingredients found in some dog foods that should raise a red flag. These sneaky additives may seem harmless—or even healthy—but they can actually harm your dog over time. Knowing what to avoid can make all the difference in choosing the right food for your canine companion.

Related: Best Dog Foods Ranked

#1 – Added Colors

Artificial colors, such as Red #40 and Blue #2, are sometimes used in pet foods. Believe it or not, these colorings have been found harmful to people, and Red #40 has even been banned in the entire European Union as a possible carcinogen! If that doesn’t tell you something, I don’t know what does. But stay away from these ingredients in your dog’s food.

Read More about FDA Dye Ban

#2 – Beef Tallow

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Beef tallow is simply beef fat, and holds no nutritional value for our dogs. Because fat brings in a lot of flavor, it’s often used in pet foods to make them more appealing to our furry friends. But keep in mind that it’s just another unnecessary, low-quality ingredient.

#3 – Corn Syrup

Corn syrup is another ingredient that’s bad for both humans and our pets. It’s an unnecessary ingredient with no nutritional value and only helps to sweeten your pet’s food. Just like sugar, pets can become addicted to eating corn syrup and refuse any nutritious meals. It’s like skipping dinner to get to your sugary dessert.

#4 – Whole Grain Corn

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Not only is corn a common ingredient that pets are allergic to, it offers no nutritional value. We may think it sounds healthy because corn is a vegetable, but the corn in our pet foods really isn’t the delicious food you’re used to eating. Commodity corns are used in pet foods as a cheap filler; it only adds more sugar and artificially increases the protein count in pet foods. It’s best to avoid all varieties of corn ingredients.

#5 – Ethoxyquin

Don’t worry about how to pronounce ethoxyquin, just make sure you know how to find it in an ingredient list. Ethoxyquin is a very harmful preservative used in pet foods. It’s also used in making rubber and as a main ingredient in pesticides. Ethoxyquin has not been approved in the European Union or Australia, but is allowed and widely used in the United States, and has been linked to liver issues in pets.

#6 – Meat By-Product

Meat by-products really are not very meat-like once they reach pet foods. Meat by-products come from any part of the animal that was not approved for human consumption, including cancerous and rancid tissues. It’s unknown (often even by the pet food manufacturer) what type of animals these by-products come from, and there are some reports that sedatives and medications used for humane euthanasia have been found in pet foods containing meat by-products.

#7 – Meat & Bone Meal

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Meat and bone meal are very similar to meat by-products in that they hold no nutritional value and can generally come from anywhere. Meat and bone meals are essentially ground-up meat by-products, including bone, that were not deemed fit for human consumption. Rancid and cancerous tissues and bones are included in meat and bone meals.

#8 – Propylene Glycol

Aside from being used as a preservative and sweetener in pet foods, propylene glycol is the main ingredient in anti-freeze. Yes! A product that is widely known to be very toxic to our pets actually shares ingredients found in pet food. You always hear that anti-freeze tastes sweet, and that’s why our pets like to drink it. Doesn’t seem too odd that low-quality pet foods will use it in their ingredients as a sweetener, does it? Definitely avoid any foods containing propylene glycol in them.

#9 – Wheat Flour

Dogs did not evolve eating grains, and their bodies are not well-adapted to digesting them. Therefore, wheat flour offers zero nutritional value for our pets. Wheat flour is sometimes used as a source of protein to make the nutrition stats on the bag look better, but it really does more harm than good.

#10 – Wheat Gluten

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Another unnecessary ingredient, wheat gluten offers no nutritional value. Simply used as a cheap protein source and filler for dry pet foods, wheat gluten should be avoided. Being just another filler means that it does more harm than good.

Protect Your Pup With Smarter Food Choices

Your dog’s health starts with what’s in their bowl. By carefully reading ingredient labels and avoiding harmful additives, you can help ensure your furry friend stays happy, healthy, and full of energy. The right food not only fuels their body but also supports their long-term well-being. Remember, every choice you make for your dog matters—and they’re counting on you to keep them safe. Opt for high-quality, nutritious options, and your pup will thank you with a wagging tail and a lifetime of love!

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