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Acromegaly
Apocrine gland adenocarcinoma
Carcinoma (squamous cell, mammary, bronchogenic, prostate, thyroid, nasal cavity)
Chronic and acute renal failure
Factitious: lipemia, postprandial, young dog (<6 mo old)
Granulomatous disease
Hematologic malignancies (bone marrow osteolysis)
Humoral hypercalcemia
Hypercalcemia of malignancy
Hyperthyroidism
Hypervitaminosis D: iatrogenic, plants (eg, day-blooming jessamine), rodenticides, antipsoriatic cream
Hypoadrenocorticism (Addison disease)
Iatrogenic disorders: excess calcium or oral phosphate binders
Idiopathic hypercalcemia of cats
Laboratory error
Lymphoma (lymphosarcoma)
Metastatic or primary bone neoplasia
Multiple myeloma
Myeloproliferative disease (rare)
Primary hyperparathyroidism
Skeletal lesions: osteomyelitis, hypertrophic osteodystrophy