A cat's stomach making gurgling sounds could be caused by the following reasons.

1. Hunger: When cats are hungry, their stomachs will purr, which is a reminder to their owners that it's time to feed them.
2. Indigestion: The cat may have recently eaten some spoiled or inappropriate food, which has caused indigestion in the cat's intestines, resulting in gurgling sounds.
3. Metabolic disorders: It could also be due to certain diseases, such as hyperthyroidism, which can increase a cat's metabolic rate, leading to hunger and rumbling in the stomach.
In short, a cat's gurgling stomach can be caused by a variety of factors. If the owner is unsure of the cause, it is best to take the cat to the vet.