When a pet’s blood test shows elevated liver enzymes it indicates liver dysfunction. High liver enzymes such as ALT (Alanine Transferase) or ALP (Alkaline Phosphatase) can be caused by viral or bacterial infections such as viral or bacterial hepatitis. High liver enzymes can also signal more serious health problems such as Cushing’s disease, drug toxicity such as extended administration of Phenobarbital or even cancer. Further blood tests are indicated to determine whether the liver condition is acute and temporary (responsive to antibiotics and anti-inflammatories) or sustained and chronic. A repeat blood test is needed in two weeks and ultrasound is the next diagnostic step if the liver enzymes remain elevated over time.