Why might a pregnant bitch have raised liver enzyme tests?

• A. ALP is found in placental cells
• B. Liver disease due to infection
• C. Bile duct obstruction
• D. Dehydration

Answer: (A)

The main idea is that alkaline phosphatase (ALP) can be elevated for reasons other than liver disease. In pregnancy, the placenta produces a large amount of ALP, so the total ALP level in a pregnant dog can rise due to this placental isoenzyme. This is a normal, pregnancy-related change, not evidence of hepatic pathology. That makes the placental source of ALP the best explanation for raised liver enzyme tests in a pregnant bitch.

Other scenarios could raise ALP or other enzymes, but they don’t fit the context as cleanly. Liver infection would imply hepatocellular injury with a broader pattern of changes, bile duct obstruction would usually produce a marked cholestatic pattern and clinical signs, and dehydration might cause mild, nonspecific changes but not a pregnancy-specific rise in ALP.