Sheep Pica: Why Sheep Eat Dirt, Wool, Wood or Unusual Things

Pica in sheep usually means they are eating things that are not normal feed, such as soil, wood, wool, bark, or other unusual materials. In many flocks, the most common driver is a nutrition problem rather than a true behavior disorder. Merck notes that sheep on mature, low-quality forage or poor hay can develop phosphorus deficiency, and sheep also need free-choice salt and balanced trace minerals to stay thrifty. When intake is low, forage quality is poor, or minerals are not matched to the region, sheep may start seeking unusual materials.

Low forage availability and hunger can also play a role. Sheep on overgrazed pasture, stemmy hay, or diets with poor fiber quality may spend more time licking or chewing non-feed items. Cornell Small Farms describes soil eating and other unusual foraging behaviors as ways ruminants may try to correct mineral deficits. In practical terms, pica often shows up when pasture is short, hay is weathered, or mineral feeders are empty, stale, or hard to access.

Not every case is caused by minerals alone. Internal parasites, chronic disease, dental problems, and skin irritation can make sheep unthrifty or lead to wool chewing and abnormal oral behavior. Merck also notes that sheep keds cause itching, biting, scratching, and wool damage, which can make wool-focused behavior look worse. If one sheep is affected, think about illness or access issues. If many sheep are affected, think first about flock nutrition, minerals, forage, and parasite control.

If your sheep is bright, eating normally, and only occasionally mouths dirt or wood, you can monitor closely while checking feed, pasture, and mineral access the same day. Make sure there is enough palatable forage for every sheep, provide a sheep-safe loose mineral and salt program, and watch whether the behavior improves over several days. It is also helpful to look at the rest of the flock. When several sheep are doing the same thing, a flock-level cause is more likely.

Schedule a veterinary visit soon if the sheep is losing weight, has poor wool quality, seems weak, has diarrhea, pale eyelids or gums, reduced appetite, or is falling behind the flock. Those signs raise concern for parasite burden, chronic disease, or a meaningful nutritional imbalance. Merck recommends removing sheep with atypical behavior or weight loss from the flock for further evaluation and treatment.

See your vet immediately if there are signs of obstruction or severe digestive upset. Red flags include repeated straining, very little manure, a swollen abdomen, obvious belly pain, severe lethargy, collapse, or sudden refusal to eat. Foreign material can sometimes contribute to impaction or obstruction, and delayed care can become serious quickly.

Your vet will start with a flock and diet history, because pica in sheep is often tied to management. Expect questions about pasture condition, hay type, grain use, mineral program, recent weather, lambing or lactation demands, and whether one sheep or many are affected. A full physical exam helps your vet look for poor body condition, anemia, dehydration, dental issues, rumen problems, skin irritation, or signs of pain.

Testing often focuses on the most likely underlying causes. Depending on the case, your vet may recommend fecal testing for parasites, bloodwork to assess overall health, and sometimes mineral testing or feed analysis if a deficiency is suspected. Merck notes that trace mineral status in sheep may be assessed with blood or, in some cases, liver testing, while phosphorus problems are strongly linked to low-quality forage and poor supplementation.

If your vet is worried about a foreign material buildup, impaction, or another digestive problem, they may recommend imaging or referral-level care. Treatment is aimed at the cause, not the chewing behavior alone. That may include correcting the ration, improving forage access, changing the mineral plan, treating parasites, addressing skin disease, or separating affected sheep for closer feeding and monitoring.

Start with the basics. Make sure your sheep has constant access to clean water, enough palatable forage, and a sheep-formulated loose mineral and salt program. Check feeders and mineral stations for crowding, moisture damage, or empty containers. If pasture is short or hay is poor quality, talk with your vet or nutrition advisor about safer ration changes rather than guessing with supplements. Sheep are sensitive to copper, so avoid using cattle minerals unless your vet specifically recommends them.

Reduce access to tempting non-feed items. Remove loose twine, treated lumber, trash, old insulation, and other materials that could be swallowed. If wool chewing is part of the problem, look for lice, keds, rubbing, or skin irritation and let your vet guide treatment. Keep a close eye on manure output, appetite, body condition, and whether the behavior is spreading through the flock.

Home care works best when it is paired with observation and records. Note when the behavior started, what the sheep is eating, and whether any recent changes happened in hay, pasture, weather, lambing, or parasite control. If there is no clear improvement within a few days, or if your sheep seems weak, painful, bloated, or off feed, contact your vet promptly.