Only part of the weight is important for nutrient requirements. It's the metabolic weight. In a food package for dogs or cats, the need for a nutrient can be informed per kg of metabolic weight.
Metabolic weight is calculated as weight0.75. Thus, for example small dogs have a proportionally higher metabolic weight than large dogs.
Metabolic weight is only indicative. The amount of energy or nutrient required varies depending, for example, on the activity of a pet. Especially the energy needs of dogs can vary greatly.
The above counter will give you a calculated metabolic weight. Below are some metabolic weights for certain weight values.
| Weight | Metabolic weight | 
| 3 kg | 2.28 kg | 
| 3.5 kg | 2.56 kg | 
| 4 kg | 2.83 kg | 
| 4.5 kg | 3.09 kg | 
| 5 kg | 3.34 kg | 
| 5.5 kg | 3.59 kg | 
| 6 kg | 3.83 kg | 
| 6.5 kg | 4.07 kg | 
| 7 kg | 4.3 kg | 
| 7.5 kg | 4.53 kg | 
| 8 kg | 4.76 kg | 
| 8.5 kg | 4.98 kg | 
| 9 kg | 5.2 kg | 
| 9.5 kg | 5.41 kg | 
| 10 kg | 5.63 kg | 
| 11 kg | 6.04 kg | 
| 12 kg | 6.45 kg | 
| 13 kg | 6.85 kg | 
| 14 kg | 7.24 kg | 
| 15 kg | 7.62 kg | 
| 20 kg | 9.46 kg |