Plain, meat-based gelatin is not bad for cats for it contains collagen and amino acids that support bone and skin health. However, flavored gelatins, as well as, the gelatin formed on the surface of Spam, are not recommended for cats. Additives such as sugar, nitrates, and salt are found in this gelatin which can cause issues detrimental to your cat’s health. Vegan-based gelatin is also not recommended since this offers no nutritional value and may even cause bowel blockage.