No additional source of calcium necessary.
Feed ration by weight
Approx. 5 - 10 kg = 0.5 to 1 can daily
Approx. 20 kg = up to 1.5 doses of 400 g daily
Approx. 30 kg = up to 2 cans of 400 g daily
The exact daily amount of food depends on the breed, age and activity level of your dog.