Dog Equal Age Calculator Formula:
   1 month dog -> 6 month human
   3 month dog -> 4 years human
   6 month dog -> 9 years human
   1 year dog -> 15 years human
   2 years dog -> 24 years human
   If the dog is older than 2 years, for samll sized dog, including puppy, add 4 years for every increased dog year; for medium sized dog, add 5 years for every increased dog year; for large sized dog, add 6 years for every increased dog year;