Feeding your pet properly comes down to five things: choosing the right food for their species and life stage, measuring the right amount, feeding on a consistent schedule, avoiding dangerous foods, and adjusting as their body changes. Get these right, and you’re handling the single biggest factor in your pet’s long-term health.
Dogs and Cats Need Different Diets
Cats are obligate carnivores, meaning their bodies are built to run on animal protein. Dogs are more flexible omnivores, but they still need protein as the foundation of their diet. This difference shows up clearly in nutritional standards. The minimum protein content for adult cat food is 26% on a dry matter basis, compared to 18% for adult dogs. Cat food also requires a higher fat minimum (9% versus 5.5% for dogs). Feeding dog food to a cat, or vice versa, can lead to nutritional deficiencies over time.
When shopping for food, look for the nutritional adequacy statement on the label. A food labeled “complete and balanced” means it contains all required nutrients in the correct ratios for a specific life stage. The statement will follow one of a few standard formats set by the Association of American Feed Control Officials (AAFCO), such as: “formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles for adult maintenance.” If you see that language, the food meets established standards. If it’s missing, you’re likely looking at a treat or supplement, not a complete diet.
How Much to Feed
The amount your pet needs depends primarily on their weight, age, and activity level. Veterinarians use a formula called the resting energy requirement (RER) as a starting point: multiply your pet’s body weight in kilograms, raised to the ¾ power, by 70. For a 22-pound (10 kg) neutered adult dog, that works out to roughly 400 calories per day just for basic body functions like digestion, breathing, and brain activity. That baseline is then adjusted upward for factors like higher activity, pregnancy, or growth.
You don’t need to do the math yourself. Most pet food bags include feeding guidelines based on weight, and those are a reasonable starting point. But treat them as estimates, not rules. A 30-pound couch potato and a 30-pound dog who runs five miles a day have very different calorie needs. The best measure of whether you’re feeding the right amount is your pet’s body over time, not the number on the bag.
Checking Your Pet’s Body Condition
Veterinarians use a body condition score on a 1 to 9 scale, where 4 or 5 is ideal. You can do a simplified version at home with two checks. First, run your hands along your pet’s ribcage. At an ideal weight, you should feel the ribs under a slight layer of fat, similar to the back of your hand. If you can’t feel them at all, your pet is carrying too much weight.
Second, look at your pet from above and from the side. From above, there should be a visible waist, a narrowing behind the ribs. From the side, the belly should tuck upward from the chest toward the hind legs. Overweight pets (a score of 6 to 9) lose that waist definition, and by a score of 7 or 8, the torso looks almost flat with no visible abdominal tuck. If your pet is trending in that direction, reduce portions gradually rather than making sudden changes.
How Often to Feed
Puppies and kittens have small stomachs and high energy demands, so they do best with three to four smaller meals spread throughout the day. This prevents the blood sugar dips that come from long gaps between meals and avoids overloading a tiny digestive system.
Most adult dogs thrive on two meals per day, typically morning and evening. Adult cats also do best with at least two meals daily, though some cats prefer three or four smaller portions. Leaving food out all day (free-choice feeding) is generally not recommended for either species, as it encourages overeating, makes it harder to track how much your pet actually consumes, and can contribute to obesity. Some cats with low food motivation do fine with one meal a day, but two is a safer default.
Wet Food, Dry Food, or Both
Both wet and dry food can provide complete nutrition if they carry the “complete and balanced” label. The choice between them often comes down to your pet’s specific needs. Wet food has high water content, which contributes meaningfully to hydration. This is especially valuable for cats, who tend to drink less water on their own and can be prone to urinary issues. Dry food is more convenient to store, typically costs less per serving, and stays fresh in the bowl longer.
Many owners mix the two, using dry food as a base and adding wet food for moisture and palatability. This is perfectly fine as long as you account for the total calories from both sources.
Water Matters More Than You Think
Healthy dogs typically need between 20 and 70 milliliters of water per kilogram of body weight each day. For a 20-pound dog, that’s roughly one to three cups daily, depending on activity level, temperature, and whether they eat wet or dry food. Cats need less total volume but are more prone to chronic low-grade dehydration, especially on an all-dry diet.
Keep fresh water available at all times and clean the bowl daily. If you notice your pet drinking significantly more or less than usual for more than a day or two, that shift can signal underlying health issues worth investigating.
Foods That Are Dangerous to Pets
Several common household foods are toxic to dogs, cats, or both. Chocolate is the most frequently reported culprit, followed by xylitol (an artificial sweetener found in sugar-free gum, candy, and some peanut butters), onions and garlic, grapes and raisins, macadamia nuts, alcohol, and unbaked bread dough.
Onions, garlic, leeks, and chives are especially insidious because the damage isn’t always immediate. These foods contain sulfur compounds that destroy red blood cells, leading to anemia. Symptoms can appear a day or more after ingestion and include vomiting, diarrhea, weakness, pale gums, rapid breathing, and dark or reddish urine. Macadamia nut toxicity has only been documented in dogs so far, and even small amounts (less than a gram per kilogram of body weight) can trigger symptoms. Grapes and raisins can cause kidney failure in dogs, and the toxic dose varies unpredictably between individuals.
The safest policy is to keep all of these foods out of reach entirely. If your pet eats something on this list, contact your veterinarian or an animal poison control hotline right away, even if symptoms haven’t appeared yet.
Storing Food Safely
Dry pet food should be stored in a cool, dry location at temperatures below 80°F. Heat and humidity break down nutrients and accelerate fat rancidity, which can make the food both less nutritious and less palatable. The FDA recommends keeping dry food in its original bag (which is designed to preserve freshness) and placing that bag inside a sealed container if you want extra protection.
Once you open a can of wet food, refrigerate any unused portion and use it within a few days. Wet food left in a bowl at room temperature for more than a couple of hours should be discarded, as bacteria multiply quickly in moist, protein-rich environments.
Adjusting as Your Pet Ages
A puppy or kitten, an active adult, and a senior pet all have different nutritional needs. Growing animals need food formulated for growth, with higher protein and calorie density. Adult maintenance food is designed for pets who have reached their full size. Senior pets often benefit from foods with slightly reduced calories (since activity tends to decline) but maintained or increased protein to preserve muscle mass.
Life transitions like spaying or neutering, pregnancy, illness, or a significant change in activity level all warrant a fresh look at what and how much you’re feeding. Weigh your pet regularly, check their body condition monthly, and adjust portions in small increments rather than dramatic shifts. Consistency and gradual change are kinder to the digestive system and make it easier to spot what’s working.