I need help on this too. you want to see if there is a proportional relationship between your age and your dogs age you make a graph by plotting the pairs of values, using the x-axis for your dogs age is there a proportional relationship? would this result be different if you used the x-axis for your age

The main difference that you would notice if dog age was on the X axis and age on Y axis you would notice a positive corrolation. if you swapped them you would see a negative corrolation!