The reasons why a cat died after eating sausage skin: 1. It may be that the sausage skin contains some unknown ingredients, which caused the cat to be poisoned and died. 2. It may be that the cat itself has been infected with some kind of disease, but it suddenly broke out after the cat ate sausage skins. 3. It may be that the cat cannot digest the sausage skin, which causes some disease in the cat.

Measures to prevent cats from dying from eating sausage skins:

1. Do not feed cats sausages, because sausages contain high salt content, which is not good for cats. Being unable to digest these salts will increase the burden on the cat’s kidneys and cause adverse effects on physical health. If a cat eats sausage for a long time, it is likely to cause the cat to be poisoned and die.

2. Pay more attention to the cat's health. You can give the cat regular physical examinations. If the cat has any bad signs, don't take it lightly to prevent the cat from dying suddenly at a certain moment.

3. If you find your cat eating sausage skins, stop it immediately and induce vomiting if necessary. If the situation is serious and urgent, take the cat to the pet hospital for examination and treatment.