Basically, hiccups can also happen in animals that have a diaphragm as the separator between the organs of breathing and the organs of digestion, and this includes all mammals. Other warm-blooded animals get hiccups just as humans do, when the diaphragm is somehow irritated, but because the physiology of animals is different from that of humans, the hiccups they produce won’t necessarily sound the same.
The word hiccup is onomatopoeic; it imitates the “hic” sound the epiglottis as it closes, and the “up” of the next breath. When other animals get hiccups, the acoustic properties of their organs affect how these disruptions sound. Cat hiccups, which occur frequently during kittenhood and sometimes after adult cats eat quickly, are often silent. In horses, hiccups are called the “thumps,” and are audible not in the area of the throat, but along the chest. These seem to be related to an electrolyte imbalance.