Oral Ulcers and Stomatitis in Alpaca: Mouth Sores, Drooling, and Pain

Oral ulcers are sores or erosions inside the mouth. Stomatitis means inflammation of the oral tissues. In alpacas, these problems can involve the lips, gums, tongue, cheeks, or roof of the mouth and can make eating, drinking, and cud chewing painful.

Some cases are small and localized, such as a single traumatic ulcer from rough forage or a sharp tooth edge. Others are more widespread and may be linked to infection, severe inflammation, or a contagious disease that affects multiple animals. Excessive salivation, oral pain, and reluctance to eat are common because ulcerated tissue is very sensitive.

In camelids, mouth sores deserve attention because alpacas often hide illness until they are fairly uncomfortable. A pet parent may first notice quidding feed, weight loss, or drool on the chin rather than an obvious lesion. If an alpaca also has fever, lameness, crusting around the lips, or several herd mates with similar signs, your vet may need to rule out important infectious diseases before assuming the problem is minor.

A common cause is local trauma. Sharp hay stems, rough browse, awns, splinters, irritating plants, or a sharp tooth edge can scrape the oral lining and create a painful ulcer. Dental overgrowth or malocclusion can also rub the cheeks, tongue, or gums and keep a sore from healing.

Infectious causes are also important. Viral diseases that create papules, vesicles, erosions, or ulcers in the mouth of ruminants include vesicular stomatitis, parapoxvirus-related diseases such as contagious ecthyma-like lesions, and other conditions that can resemble foot-and-mouth disease. Secondary bacterial infection may develop in damaged tissue, making lesions deeper, smell worse, and heal more slowly.

Chemical irritation, caustic drenches, and accidental exposure to irritating topical products can inflame the mouth as well. Less commonly, systemic illness, severe nutritional stress, or immune-related inflammation may contribute. Because several very different problems can look similar at first glance, your vet usually needs to examine the whole alpaca, not only the sore itself.

Diagnosis starts with a careful history and oral exam. Your vet will ask when the drooling started, whether the alpaca is still eating, what forage and supplements are being fed, whether any new plants or chemicals were introduced, and whether other herd mates are affected. A full mouth exam may require a speculum, good lighting, and sometimes sedation so the cheeks, tongue, palate, and teeth can be evaluated safely.

Your vet may look for traumatic wounds, foreign material, overgrown incisors, sharp dental points, abscesses, or crusting around the lips. Depending on the findings, testing can include bloodwork, swabs, culture, or PCR testing of lesions. If the pattern suggests a vesicular or other reportable livestock disease, your vet may involve state or federal animal health officials right away.

Additional tests are chosen based on severity. An alpaca that is dehydrated, losing weight, or not swallowing normally may need blood chemistry, imaging, or hospital-level supportive care. The goal is to identify the underlying cause, control pain, maintain nutrition and hydration, and reduce risk to the rest of the herd if an infectious disease is possible.

Prevention starts with routine herd management. Offer clean forage, avoid coarse or contaminated feed, and check pastures and pens for sharp wire, splintered feeders, thorny browse, or irritating plants. Regular dental checks matter in camelids because overgrown incisors or other oral abnormalities can create repeated trauma.

Good biosecurity also helps. Isolate alpacas with new drooling, lip crusts, or mouth lesions until your vet advises otherwise, especially if more than one animal is affected. Do not share equipment between sick and healthy groups without cleaning and disinfection, and use gloves when handling suspicious lesions because some parapox-type diseases can infect people.

Work with your vet on a herd health plan that includes prompt evaluation of eating changes, weight loss, and oral discomfort. Early attention to small mouth injuries, dental issues, and infectious disease concerns can reduce pain, shorten recovery, and lower the chance of spread through the herd.