Final answer:
The normal packed cell volume (PCV) in dogs is about 45%, reflecting the volume percentage of erythrocytes in the blood.
Step-by-step explanation:
The normal packed cell volume (PCV) in dogs is approximately 45%. This value represents the volume percentage of erythrocytes (red blood cells) in the blood after centrifugation. While hematocrit levels can vary according to genders and other factors, ranging from 36-50%, the average hematocrit values are about 41% for females and 47% for males. As white blood cells (WBCs) and platelets make up a very small percentage of the blood volume, they are not typically considered in the PCV.
Considering these factors, the most accurate answer to the student's question from the given options is b. 45%.
The normal packed cell volume (PCV) in dogs is approximately 45%. This means that about 45% of a dog's blood volume is made up of erythrocytes, or red blood cells. The PCV can vary between 36-50% depending on factors such as gender and other individual characteristics.