I study acid, and corrosive liquids are very destructive. Nitric acid was not very corrosive at first, but it became very corrosive later. You didn't wash the dog's hoof with a lot of water, and then you didn't apply alkaline substances to neutralize it, which caused this consequence. The first step in recovery is to ensure that the wound is not infected and inject antibiotics into the pet shop. The second step is to apply disinfectant to the wound at the same time. It is best to use a less irritating disinfectant, such as Leifonoll, which can be bought in the hospital. It's very cheap. It's best to buy a yellow soaked cotton ball (never use disinfectants such as iodophor). The third step is to buy dog shoes, keep the naked body away from the ground, and disinfect it with alcohol every day. It will take at least half a year to get back to the way it was before, and it will take at least two years for human beings.