To determine a dog's age based on a human's age using a proportional relationship, we need to refer to the graph. Since I can't see images, I cannot provide a specific number without additional details from the graph.
Generally speaking, the common approach is that the age of a dog (in "dog years") is often considered to be about 7 times the age of a human (common rule of thumb), but this can vary depending on the breed and size of the dog.
If you can describe the graph or provide the proportional relationship indicated by the graph, I can help you calculate the dog's age when a human is 3 years old.
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