Goats that look like they’re chewing on nothing are almost always chewing their cud. It’s a normal part of digestion called rumination, and healthy goats do it for roughly four and a half to five hours every day. That said, there are a few less common reasons a goat might move its jaw with no visible food present, and some of them are worth paying attention to.
Cud Chewing: The Most Likely Explanation
Goats are ruminants, meaning they digest food in stages. When a goat eats hay, browse, or grass, it chews just enough to swallow the material into a large fermentation chamber called the rumen. Later, often while resting, the goat pumps a small wad of partially digested food (the cud) back up through the esophagus into its mouth. It then re-chews that cud thoroughly and swallows it again. If you watch closely, you can actually see the cud traveling up and down the goat’s neck.
This cycle repeats dozens of times throughout the day. Research published in Scientific Reports found that goats ruminate for an average of 281 minutes per day, or just under five hours, regardless of season. Goats often ruminate while lying down and looking relaxed, which is why it can seem like they’re chewing on absolutely nothing. The cud is small and stays inside the mouth, so from the outside all you see is steady, rhythmic jaw movement with no food in sight.
Rumination is a sign of good health. A goat that stops chewing its cud is far more concerning than one that seems to chew constantly. The process generates large amounts of saliva that help buffer the rumen’s acidity and keep digestion running smoothly.
Stress and Boredom Chewing
Not all empty chewing is rumination. Goats kept in restrictive environments sometimes develop repetitive oral behaviors that serve no digestive purpose. These are called stereotypies: patterned, repetitive actions that emerge when an animal can’t perform its natural behaviors. In goats, this can look like jaw grinding, tongue rolling, or chewing motions without any cud or food involved.
Research in the journal Animals found that these behaviors often develop when goats don’t spend enough time searching for and chewing food. In the wild, goats are browsers that spend hours picking through shrubs, bark, and leaves. When their diet is mostly concentrated feed (grain pellets, for example) rather than long-stemmed forage like hay or browse, they finish eating quickly and have nothing left to chew. The lack of roughage also means less saliva production, which appears to drive compensatory mouth movements. The study noted that this oral activity tends to spike as feeding time approaches, suggesting the goat is motivated to forage but has nothing to work with.
If your goat is chewing in a rapid, repetitive way that looks different from the slow, deliberate rhythm of cud chewing, and especially if it’s confined to a small space with limited forage, boredom or frustration is a likely cause. Providing more hay, browse (branches, shrubs, weeds), or other roughage typically reduces these behaviors by giving the goat something to actually chew on for longer periods.
Mineral Deficiencies and Pica
Goats that are deficient in certain minerals sometimes develop pica, an abnormal appetite for non-food items. You might see them licking dirt, chewing on rocks or fence posts, or mouthing at objects that aren’t food. From a distance, this can also look like chewing on nothing.
Sodium and phosphorus deficiencies are the most commonly associated with pica in ruminants, though energy or protein imbalances, intestinal parasites, and deficiencies in other trace minerals can also trigger it. If a goat is repeatedly mouthing odd objects or seems fixated on licking surfaces, it’s worth reviewing their mineral supplementation. Free-choice loose minerals formulated for goats (not cattle or sheep blocks, which have different compositions) help prevent most deficiencies.
How to Tell What’s Going On
The distinction between normal cud chewing and something worth investigating comes down to a few details. Cud chewing is slow, rhythmic, and relaxed. The goat is usually lying down or standing calmly, and you can sometimes see a slight bulge moving in the throat as the cud comes up. The jaw swings side to side in a grinding motion, and the goat looks content.
Stereotypic chewing tends to be faster, more mechanical, and happens in goats that seem restless or understimulated. It may come with other repetitive behaviors like pacing, bar biting, or excessive licking. Pica looks different again: the goat is actively seeking out and mouthing objects, not just moving its jaw in the air.
A goat that has stopped ruminating altogether, or one that is grinding its teeth (a sharper, audible sound distinct from cud chewing), may be in pain or dealing with a digestive problem. Teeth grinding in goats is a recognized sign of abdominal discomfort, bloat, or other illness. Combined with other symptoms like lethargy, loss of appetite, or an inability to stand, jaw movements can occasionally point to neurological conditions that affect the cranial nerves controlling the face and mouth.
In the vast majority of cases, though, a goat chewing on “nothing” is simply doing what goats are built to do: processing a meal for the second or third time. It’s one of the most reliable signs that your goat’s digestive system is working exactly as it should.