Different pet dogs have different food densities, so the recommended feeding amount is also different. For example, my dog has been feeding champion dog food, and it is one hundred and fifty grams every day. Not if it's anything else.
After feeding the dog, you can touch the dog's stomach. If you eat too much, it will swell especially obviously, and if you eat less, it will shrink. Then adjust the feeding amount according to the specific food intake of the dog.
Three and a half months of fighting is only 4 kg, which is too thin. If there is no deworming, be sure to take the dog to deworm and then prepare nutritious food for the dog.