There is no single number that answers this for every dog, and that is the honest starting point. How much to feed depends on your dog's weight, age, activity level, whether they are spayed or neutered, and the calorie density of the specific food in the bowl. The feeding chart on the bag is a reasonable place to begin, but according to VCA Animal Hospitals, those charts are calculated for an average active dog, so most pet dogs fed the full listed amount are actually overfed. The most reliable guide is not a chart at all: it is your dog's body, checked regularly.
Start with the feeding chart, then adjust down
Feeding guidelines printed on the package can be used as a starting point if your dog is healthy, but they are a starting point and not a prescription. VCA notes that because most pet dogs are minimally active, a more sensible opening portion is often about 15 to 20 percent below the amount the bag suggests, then adjusted based on how your dog's weight responds over the following weeks.
Feeding charts are organized by body weight for a reason: a 10-pound dog and an 80-pound dog have very different calorie needs. But two dogs of the same weight can still need different amounts. A young, intact working dog burns far more than a senior lap dog of identical size. This is why every reputable chart is a range, not a fixed figure.
Age and life stage change the math
Puppies are the biggest exception to adult feeding rules. According to VCA's puppy nutrition guidance, growing puppies need more calories per pound than adults and are usually fed a complete-and-balanced growth formula, divided into three or four small meals a day when very young because their stomachs and energy reserves are small. Large and giant breed puppies have their own consideration: growing too fast on too many calories can stress developing joints, so their diets and portions are worth discussing directly with your veterinarian.
Adult dogs generally do well on one or two measured meals a day. Senior dogs often need fewer calories as they slow down, but not always fewer nutrients, so a portion cut without a food change is not automatically the right move. If you are changing foods to match a new life stage, do it gradually rather than overnight, as covered in our guide to switching your dog's food safely.
Body condition score is the real feedback loop
The single most useful skill an owner can learn is body condition scoring, a hands-on check that tells you whether the amount you are feeding is actually right for the dog in front of you. The World Small Animal Veterinary Association publishes a widely used 9-point body condition scale, with an illustrated dog chart you can print and keep on the fridge. The goal for most dogs is a score of 4 or 5 out of 9.
WSAVA describes a simple look-feel-look routine. Run your hands along the ribs: you should be able to feel them easily under a thin layer of fat, without pressing hard, the way you can feel the back of your hand. Look at your dog from the side: there should be an upward tuck from the chest to the belly. Look from above: there should be a visible waist behind the ribs. If the ribs are buried and there is no waist, your dog is carrying extra weight. If the ribs, spine, and hip bones are sharply visible, your dog is likely underweight.
A helpful reality check from WSAVA's nutrition materials: an ideal body condition often looks "too thin" to owners who are used to seeing overweight dogs, because overweight has become so common. Trust the hands-on check over your first impression.
When to ask your veterinarian
Charts and body condition scoring cover healthy adult dogs. Talk with your veterinarian if your dog is a puppy (especially a large or giant breed), is pregnant or nursing, has a medical condition such as kidney disease, diabetes, or pancreatitis, or is losing or gaining weight despite steady, measured feeding. Your veterinary team can run a proper energy calculation based on your individual dog and recommend a specific daily calorie target, which is far more precise than any printed range.
Unexplained changes in appetite or weight are worth a call rather than a wait. They are not something to diagnose from an article, but they are often the first visible sign that something has shifted and deserves a professional look. For the companion question of what your dog should be drinking alongside those meals, see how much water should my dog drink.