There is a calculator on the Shop Page where you can enter your dog’s weight and calculate the recommended serving amount.
5g per 5kg of your dog’s weight up to 15 kg then 5g per 10 kg of dog’s weight.
Easiest way is once you know the amount to add per day, to weigh that on kitchen scales and find a spoon or container that can become the measure you use every-day. It is better to over-dose than under to ensure the micronutrients, and a little extra will not harm at all and your dog will be pretty happy with that too!
5g = level/flat tablespoon
10g = rounded tablespoon
15g = heaped tablespoon