The materials that need to be prepared in advance include: 3g pigskin and appropriate amount of salad oil.

1. Wash the pigskin, boil it in water, and scrape off the excess fat with a knife.

2. Then string them together with ropes, hang them in a ventilated place and dry them.

3. Put the clear oil in the pot, and at the same time, put the pigskin in. As the oil temperature rises, the pigskin will bubble, so take it out first and let it cool.

4. Then reheat the oil temperature, and put the fried pigskin back in. This time, the pigskin will swell, as shown in the following figure.

5. Take it out, let it cool, cut it into small pieces and feed it to the dog.