A white-faced sheep grazing a new grass ley presents with swollen oedematous head and ears. Clinical examination reveals lacrimation, and sensitive erythematous non-pigmented skin with oozing of serum. The rectal temperature is normal.
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What endocrinopathy should be considered in a cat with insulin-resistant diabetes mellitus, hepatomegaly, and a large head with a protruding mandible?
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[[Image:Sheep Medicine 10.jpg|center|200px|link=Sheep Medicine Q&A 10]]