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Why is dog food different from cat food?

There is a common remark made by pet owners choosing food for the first time. "Aren't all pet foods pretty much the same?" However, the ingredient composition of dog food and cat food is fundamentally different. Unlike cats, dogs are omnivores and can digest carbohydrates to some extent. However, this does not mean that just any food is fine.

Dog food has a low taurine content. This is because cats cannot synthesize taurine on their own and must supplement it through food, whereas dogs can synthesize it to some degree within their bodies. Conversely, cat food has much higher protein and fat content, so if a dog consumes it for a long period, it can lead to obesity or digestive disorders. This is precisely why you must feed the food for the two animals separately. This article summarizes the key points on how to read dog food ingredient labels.

There are 4 essential things you must check on a dog food ingredient label.

While checking cat food primarily focused on protein, dog food requires examining carbohydrate balance, calcium and phosphorus ratios, breed, and age in addition to protein. Let's check these four key points in order.

First — Checking the order of ingredients and protein/carbohydrate balance.

Just like cat food, the list of ingredients for dog food is written in order of highest content. The principle that the first item must be animal protein remains the same. Foods where meat such as chicken, beef, salmon, or duck appears in the first ingredient position are a positive sign. It is not a problem if whole grains such as brown rice, oats, and barley are included in appropriate amounts as they are easily digestible sources of carbohydrates.

On the other hand, if corn, wheat, or soybeans occupy the top two spots in the ingredients list, or if only meat by-products are listed without specifying the particular cuts, you need to take a closer look. Although dogs are omnivores, protein remains the most important nutrient, and carbohydrates should only serve as a supplementary energy source.

▶ View dry dog food on Coupang

Second — Checking Nutritional Values for Dogs

There are key figures to check in the ingredient analysis table based on the dog. Since the numerical standards differ from those for cats, care must be taken to avoid confusion.

The dry food standards generally recommended by veterinarians are as follows: Crude protein should be at least 18% for adult dogs and at least 22% for puppies and pregnant dogs. Crude fat should be at least 5% for adult dogs and at least 8% for high-activity breeds. A calcium-to-phosphorus ratio of 1:1 to 2:1 is recommended, as this ratio directly affects bone health. Since Omega-3 and Omega-6 are involved in coat and skin health, it is advisable to check for their presence.

In particular, the ratio of calcium and phosphorus is much more critical in dog food than in cat food. A persistent imbalance can lead to bone and joint problems, so this must be checked for large breeds or growing puppies. It is recommended to consult with a veterinarian for precise numerical standards.

Third — Identifying Ingredients to Avoid

Just like with cats, it is best to choose dog food that contains as little of certain ingredients as possible. Products using natural preservatives, such as Vitamin E or rosemary extract, are a better choice than synthetic antioxidants like BHA and BHT. Artificial coloring is an unnecessary ingredient for dogs. Salt and sugar are sometimes added to improve palatability, but the lower the content, the better.

Grain-free food is not always the best option. Some studies have reported a link to heart disease in certain large dog breeds. It is safer to consult with a veterinarian before choosing grain-free food.

Fourth — Choosing Food Suitable for Breed, Age, and Weight

Dog food offers a much wider range of choices than cat food. This makes it all the more important to choose the right food for your dog.

For small dogs (such as Malteses and Pomeranians), it is best to choose food with small kibble sizes and high calorie density. Energy density is important for small dogs due to the risk of hypoglycemia. For large dogs (such as Retrievers and Labradors), food containing glucosamine and chondroitin is recommended for joint health. Foods with excessive calcium should be avoided to inhibit rapid growth. For senior dogs (7 years or older), it is advisable to choose food that maintains protein content while being low in phosphorus, and to check for the presence of digestive enzymes and the antioxidants Vitamins E and C. For puppies (under 12 months), choose food labeled "Puppy" or "Puppy Food," and check for the presence of DHA, which aids in brain development.

▶ View dog and senior dog food on Coupang

4 Practical Tips to Know When Choosing or Switching Dog Food

Now that you know how to read the ingredient list, it is also a good idea to know the precautions to take when actually selecting and switching food.

Tip 1. Check for AAFCO Certification Statements

If the phrase "Meets AAFCO Nutritional Standards" appears on the food packaging, it is a product that has passed international pet nutrition standards. Many domestic products also follow these standards, so referring to them can help you judge the quality of the food.

Tip 2. Switch food slowly over 10 to 14 days

When switching to a new food, it is best to gradually replace it over 10 to 14 days, increasing the mixing ratio by 10 to 20 percent at a time. Dogs often have more sensitive digestive systems than cats, so a sudden switch can lead to vomiting or diarrhea.

Tip 3. Stool condition is the best indicator

No matter how good the ingredients are, food may not be suitable for an individual dog. Observe the condition of the stool, coat shine, and vitality for 2 to 3 weeks after switching to the new food. If the stool becomes loose or smells strong, it could be a sign that the food is not right for the dog. If your dog suddenly stops eating or lacks energy, I recommend reading When a pet is sick, the owner's feelings are also considered.

▶ View wet dog food on Coupang

Tip 4. Check the ingredient list before the brand

Expensive food isn't necessarily the best. You can find products with excellent raw materials and nutritional values even among foods in reasonable price ranges. The habit of reading the ingredient list yourself is the surest way to protect your dog's health.

Conclusion — You only need to remember four things about dog food

There are four key things to check on a dog food ingredient list. You need to verify whether the first item in the ingredients is animal protein, whether the dog-specific values—such as crude protein and calcium/phosphorus ratios—meet the standards, whether there are any additives to avoid, and whether the product is suitable for your dog's breed and age.

While you only needed to focus on protein for cats, you need to examine dogs a little more meticulously. It may look complicated, but the core is ultimately just one thing. The proof of good food is that your dog eats it well, digests it healthily, and lives an energetic life. If you also want to understand cat food ingredient labels, referring to How to Read Cat Food Ingredient Labels will help you compare the differences between the two animals.

If you are adopting a dog for the first time or are wondering which pet is right for you, we also recommend reading Dog vs. Cat, Which Pet Is Right for Me?.

※ The nutritional figures in this article are for general reference only; please consult a veterinarian for accurate food selection.