In adult dogs, the guide is to feed between 2 and 3% of the animal’s body weight daily (or of their ideal body weight if they need to gain/lose weight).
Every dog is an individual and many need more or less than the guidelines. We feed for body condition, if they look a bit chubby we decrease, in winter/after long walks, we feed more! It’s important not to get fixated on percentages, every animal is an individual, looks and feel are what matters.
You’ll find more info on feeding guidelines here