This phenomenon you are talking about is a manifestation of malnutrition and calcium deficiency! Calcium tablets are not necessarily easy to absorb. It is recommended to feed bone soup instead of bones, as follows! If there is calcium powder, add some to the food. You can buy baby rice noodles instead of rice soup ~ soak a small amount of dog food (be sure to soak it soft), let it bask in the sun and lie on the grass, but keep warm and try to protect its stomach with cotton cloth to avoid catching cold. Stick to it and you will make progress!
Dog, just full moon, no mother. It is very fragile. Take good care of it!