Ataxia and head tremor in an alpaca (Lama pacos)

An 18-month-old alpaca developed nervous signs, including swaying of the head and neck, a wide-based stance and hind-limb ataxia. No certain diagnosis was made but the animal recovered after successive treatment with amoxycillin, vitamin B1, ivermectin and copper oxide, followed by vitamin E and selenium. The differential diagnosis rationale of treatment is described.