To determine a dog's age based on a human age of 3 years using the provided graph, you'll need to find the corresponding value on the dog age axis that aligns with 3 years on the human age axis. If the graph shows a direct proportionality, you can trace the point for human age of 3 years to find the equivalent dog age.
Since I cannot see the image, I cannot provide the exact dog age. However, if you observe the graph and locate the point for 3 years on the human age scale, you will find the corresponding dog age there. If you have any specific data or points from the graph, feel free to share, and I can help you interpret it!