Pet Food Honesty

Macronutrients in Dog Food – Fats, Protein, and Carbs for Dogs Explained

Understanding your dog’s nutrition is critical for ensuring they live a long, healthy life. One of the key aspects to focus on is macronutrients—protein, fats, and carbohydrates. This article aims to unpack what these terms mean, their importance in dog food, and how to make informed choices for your furry friend.

What Are Macronutrients?

Macronutrients are nutrients that provide energy and are essential for various physiological functions. Unlike micronutrients like vitamins and minerals, which are needed in smaller amounts, macronutrients are required in larger quantities. They are the building blocks of your dog’s diet and significantly influence overall health.

The Three Main Macronutrients

Protein, fats, and carbohydrates are the trifecta of macronutrients that contribute to your dog’s well-being. These are usually represented in percentages on dog food labels, providing a snapshot of the food’s nutritional value.

Protein in Dog Food

Why is Protein Essential?

Protein plays a vital role in almost every biological process. It’s crucial for tissue repair, muscle growth, and the production of hormones and enzymes. Depending on your dog’s life stage—whether they’re a growing puppy, an active adult, or a less active senior—the protein requirements may vary.

High-Quality Sources of Protein in Dog Food:

  • Chicken: Lean and rich in essential amino acids, chicken is a widely used and well-tolerated protein source for dogs.
  • Fish (Salmon, Sardines, Tuna): High in Omega-3 fatty acids and easily digestible, fish is an excellent protein source.
  • Beef: A good source of essential amino acids and several important nutrients like iron and B vitamins.
  • Lamb: Generally well-tolerated, lamb is a rich source of protein and essential nutrients like zinc.
  • Turkey: Another lean, easily digestible protein that’s lower in fat compared to other meats.
  • Venison: Often used in hypoallergenic diets, venison is a novel protein that is less likely to cause allergies.
  • Eggs: Complete protein containing all essential amino acids, but should be cooked to avoid the risk of salmonella.
  • Duck: Often used in limited-ingredient dog foods for dogs with sensitivities or allergies to more common proteins.

Low-Quality Sources of Protein in Dog Food:

  • Meat By-products: These are unspecified meats that can vary in nutritional value and can come from almost any animal, including animals that are diseased or dying.
  • Meat Meal: While not necessarily a low-quality protein source, the quality can vary greatly if the animal source is not specified (e.g., “animal meal” rather than “chicken meal”).
  • Corn Gluten Meal: A by-product of corn processing that’s used as a protein source but lacks essential amino acids.
  • Soy Protein Isolate: A heavily processed form of soy that lacks many of the essential amino acids needed by dogs.
  • Bone Meal: An inferior protein source often used as a filler; it is not easily digestible and lacks many essential nutrients.
  • Feather Meal: Highly processed and low in essential amino acids, this is considered a low-quality protein source.
  • Plant Proteins (Pea Protein, Potato Protein): While not necessarily bad, plant proteins are less bioavailable and contain fewer essential amino acids than animal proteins.

Protein Requirements

Veterinarians generally recommend a diet consisting of at least 18-25% protein. However, this can vary based on factors such as age, activity level, and health conditions. Working dogs may need more protein, while less active or older dogs might require less. At the end of this article we’ll cover special conditions that could impact how much protein your dog needs.

Fats in Dog Food

Why Are Fats Important?

Fats are an indispensable part of a dog’s diet, serving multiple functions that go beyond simply supplying energy. They are the most concentrated form of energy, providing more than double the energy per gram compared to proteins and carbohydrates. This is especially important for active breeds or working dogs who need a readily available energy reserve to perform their tasks.

In addition to being a potent energy source, fats are the carriers for essential fatty acids, most notably Omega-3 and Omega-6. These fatty acids are termed “essential” because they cannot be synthesized by the dog’s body and must be obtained from the diet.

Omega-3 Fats

Omega-3 fatty acids, found in fish oils and flaxseed, are known for their anti-inflammatory properties. They can help mitigate the symptoms of allergies and arthritis, and they also support heart health.

Omega-6 Fats

Omega-6 fatty acids, on the other hand, are abundant in many animal fats and some plant oils. They are crucial for maintaining a healthy skin barrier, which helps to keep out allergens and infections. A proper balance of Omega-3 and Omega-6 in your dog’s diet can significantly enhance coat quality, giving it a shiny, healthy appearance.

High-Quality Sources of Fats in Dog Food:

  • Fish Oil: Rich in Omega-3 fatty acids, supports coat health and helps reduce inflammation.
  • Flaxseed Oil: Another good source of Omega-3 fatty acids, though not as easily absorbed as fish oil.
  • Chicken Fat: While it sounds less appealing, chicken fat is actually a healthy source of essential fatty acids.
  • Sunflower Oil: High in linoleic acid, an Omega-6 fatty acid important for skin and coat health.
  • Olive Oil: Rich in monounsaturated fats and antioxidants.
  • Safflower Oil: High in linoleic acid and Omega-6 fatty acids, it’s a good option for skin and coat health.
  • Coconut Oil: Provides medium-chain triglycerides and has antibacterial properties, though should be used in moderation due to its saturated fat content.
  • Krill Oil: Another rich source of Omega-3s, often considered more sustainable than traditional fish oils.

Low-Quality Sources of Fats in Dog Food:

  • Lard/Tallow: These are animal fats that are generally considered lower quality due to their high saturated fat content.
  • Soybean Oil: While not terrible, it’s less balanced in Omega-3 and Omega-6 fatty acids compared to other oils.
  • Corn Oil: Typically used as a cheaper alternative and not the best choice for Omega fatty acid balance.
  • Palm Oil: High in saturated fats and often associated with environmental concerns.
  • Generic Animal Fats: When the animal source is not specified, it’s hard to determine the quality.
  • By-product Fats: These are fats that are by-products from meat processing and are of unknown or inconsistent origin.
  • Canola Oil: While it contains Omega-3 and Omega-6 fatty acids, it is often genetically modified and has a less ideal fatty acid profile compared to other high-quality oils.

Fat Requirements

A diet comprising around 10-15% fats is generally considered adequate for most dogs. Special considerations may include conditions like obesity or skin diseases, which may require adjustments to fat intake.

Carbohydrates in Dog Food

Role of Carbohydrates

Beyond just energy, carbohydrates contribute to digestive health in a number of ways. Many commercial dog foods contain carbohydrates in the form of grains like rice, barley, and oats, or from vegetables like sweet potatoes and peas. These ingredients are sources of fiber, a type of carbohydrate that is not fully digested by dogs but serves an essential role in their gut health.


Fiber helps regulate the digestive system by adding bulk to the stool, making it easier for your dog to defecate and thereby aiding in the prevention of constipation. It also acts as a prebiotic, providing nourishment for beneficial bacteria in the gut, which in turn contributes to overall digestive health and even immune function.

Moreover, fiber is excellent for weight management. It adds volume to the diet without adding extra calories, helping to fill up your dog’s stomach and promoting a feeling of fullness. This can be particularly beneficial for dogs that are prone to overeating or are on a weight-loss plan, as it helps to reduce the overall caloric intake while still allowing the dog to feel satisfied after meals.

High-Quality Sources of Carbohydrates in Dog Food:

  • Sweet Potatoes: A great source of fiber, vitamins, and minerals.
  • Brown Rice: Offers complex carbohydrates and is easier to digest than white rice.
  • Barley: Rich in fiber and provides steady, slow-burning energy.
  • Quinoa: A gluten-free grain that is high in protein and various essential amino acids.
  • Oats: High in fiber and nutrients, and generally well-tolerated by dogs.
  • Pumpkin: Excellent for digestive health, providing both soluble and insoluble fiber.
  • Peas: Provide good amounts of fiber and protein, but should not be the primary carb source due to their high phytic acid content.
  • Lentils: Another legume that is high in fiber and protein but should be used in moderation.

Low-Quality Sources of Carbohydrates in Dog Food:

  • Corn: Often used as a cheap filler; some dogs are allergic or sensitive to corn.
  • Soy: Another common filler that can cause allergies in some dogs.
  • White Rice: While not inherently bad, white rice is a simple carb and doesn’t offer the fiber that brown rice does.
  • Wheat: Can be hard for some dogs to digest and is a common allergen.
  • Sorghum: Generally used as a cheaper alternative to more nutritionally dense grains.
  • Tapioca: Provides very little nutrients and is generally used as a filler.
  • Potato: While not inherently bad, white potatoes have a high glycemic index and can contribute to weight gain if fed in large amounts.
  • Cereals: Some low-quality dog foods use processed cereals as carb sources, which offer little nutritional value.

Carbohydrate Requirements

There is no definitive guideline for carbohydrate requirements in dogs, but most commercial dog foods contain between 30-70% carbohydrates. Grain-free diets and low-carb diets have become popular, but their benefits are still a subject of research and debate.

How to Evaluate Macronutrients on Dog Food Labels

Understanding the macronutrient content in dog food begins with a close examination of the “Guaranteed Analysis” section on the packaging. This section typically lists the minimum percentages of protein and fat, along with the maximum percentages of fiber and moisture. However, equally important is the ingredient list, where the quality of those macronutrients comes into focus.

Good First Ingredients

In general, high-quality animal proteins should be at the top of the ingredient list, as ingredients are listed by weight. This means a dog food with chicken, beef, or fish listed as the first ingredient will likely be higher in protein and provide more essential amino acids. Such proteins are usually more bioavailable, meaning they are easier for your dog to digest and use for tissue repair, muscle building, and other vital functions.

Other good first ingredients might include meat meals (like chicken meal or fish meal), which are concentrated sources of animal protein. Don’t be turned off by the term “meal”; it simply means the water has been removed, making it a concentrated form of protein.

Bad First Ingredients

Conversely, dog foods that list corn, soy, or grain fillers like wheat as the first ingredient may not offer the same nutritional benefits. These ingredients are generally used as cheaper alternatives to animal protein. While they do provide some nutritional value, they are not as bioavailable as animal proteins and can contribute to food sensitivities or allergies in some dogs.

Meats First: Quality and Cost

When animal proteins are listed as the first ingredient, the food is often more expensive. Quality animal-based proteins cost more to source, process, and preserve than plant-based proteins or fillers like corn and wheat. However, the higher upfront cost usually pays off in the long run. Diets rich in high-quality proteins are generally more satisfying for dogs, which means they may eat less and absorb more essential nutrients. Over time, this can contribute to better overall health and potentially fewer veterinary visits, offsetting the initial higher cost of the food.

A food with high-quality protein as the first ingredient is often more nutrient-dense, requiring smaller serving sizes to meet your dog’s nutritional needs. On the other hand, foods with grains or plant-based proteins as the primary ingredients may require larger serving sizes to provide the same nutritional value, which can also result in more frequent refilling of your pet’s food bowl and more waste to dispose of.

In summary, while dog foods that feature meats as the first ingredient are usually more expensive, they are generally of higher quality and offer greater nutritional benefits. Therefore, evaluating the first ingredient can provide significant insight into the overall quality of the dog food you’re considering for your pet.

Special Dietary Considerations for Dogs

While the focus on macronutrients is important for the general population of dogs, there are several special dietary considerations to take into account based on health conditions or lifestyle factors. Consulting a veterinarian is crucial for personalized advice tailored to these special needs.

Possible Dietary Restrictions or Conditions/Concerns:

  • Food Allergies or Sensitivities: Some dogs are allergic or sensitive to certain proteins or grains, requiring hypoallergenic or grain-free diets.
  • Obesity: Overweight dogs may need a diet lower in fats and carbohydrates but higher in fiber and protein to help with weight loss.
  • Diabetes: A diet low in simple carbohydrates and higher in complex carbohydrates, fiber, and protein is generally recommended for diabetic dogs.
  • Kidney Disease: Lower protein and phosphorus levels may be necessary to manage this condition.
  • Liver Disease: Diets for liver disease often focus on high-quality protein and lower fat content.
  • Pancreatitis: Low-fat diets are generally advised for managing pancreatitis.
  • Puppy vs. Adult vs. Senior: Different life stages require varying levels of protein, fats, and carbohydrates.
  • Working Dogs: High-energy breeds or working dogs may require higher protein and fat levels for sustained energy.
  • Pregnant or Lactating Dogs: Higher levels of most nutrients, especially protein and calcium, are needed during these life stages.

Signs Your Dog May Have a Dietary Concern to Consult Their Vet About:

  • Frequent Scratching or Skin Irritations: Persistent scratching or skin rashes may indicate a food allergy or sensitivity.
  • Lethargy or Low Energy Levels: A constant low energy level could mean that the diet is not providing adequate nutrients or that a medical condition is present.
  • Digestive Issues: Constant diarrhea, frequent vomiting, or signs of constipation may be signs of a dietary problem or intolerance.
  • Excessive Thirst or Urination: This could be a sign of diabetes or other metabolic conditions that require dietary management.
  • Weight Changes: Rapid weight gain or loss could indicate a variety of concerns, including thyroid issues, diabetes, or the need for a more balanced diet.
  • Bad Breath or Dental Issues: While dental problems may not directly relate to diet, some foods are better for dental health than others. Persistent bad breath could be a sign of digestive issues.
  • Coat and Skin Condition: A dull coat, dandruff, or excessive shedding may indicate nutritional deficiencies or allergies.

If you observe any of these signs or have other concerns about your dog’s well-being, a consultation with your veterinarian is crucial for proper diagnosis and dietary recommendations. Keep in mind that a diet perfectly suited for one dog may not be ideal for another, even if they’re of the same breed or size. Therefore, personalized veterinary advice is indispensable.

Additional Resources

For further reading, consider these books and articles:


Can I give my dog a high-protein diet?

High-protein diets are generally safe for healthy adult dogs but dogs that are obese or have kidney problems may want to avoid high-protein. Consult your veterinarian for personalized advice.

Are fats harmful to dogs?

Fats are essential but should be moderated, especially in dogs prone to obesity or pancreatitis.