Owner, seeing as your son has grown so big, how could he be deficient in calcium? Besides, since you trust Changming’s medical equipment, you should do a calcium test and laboratory test on the dog. The data can show whether it is deficient. As for the problem of calcium, as long as it eats dog food normally, gets more sun exposure, and exercises more, there will be no problem of low calcium at all, unless it is born with calcium absorption disorder.