Final answer:
To calculate the age of Jamie's dog when her cat is 7 years old, additional information is needed, which the question does not provide. Without knowing the current ages or the relationship between their ages, an exact age cannot be determined.
Step-by-step explanation:
To determine the age of Jamie's dog when her cat is 7 years old, we would need additional information, such as the current ages of the dog and cat or the relationship between their ages. Without this information, it's impossible to provide an exact age for Jamie's dog. If we assume that there is a specific age difference between the dog and cat that remains constant or if we have a formula that relates their ages, then we could use mathematics to calculate the dog's age. However, since none of this information is provided in the student's question, we can't calculate the age of the dog.