Animal Age is a program designed to help you convert human years to the ages of multiple types of animals, such as dogs, cats, rabbits, etc. The application will also reveal the life expectancy for the selected animal breeds.
This utility comes with an intuitive interface where all you need to do is to enter the human years value and select the preferred animal type from a given list. Animal Age will immediately display the results as soon as you make your selections.
Even though the program appears to work well, I don't think the offered results are reliable. For instance, there are too little variables when making the necessary selections for the conversion process. To be more exact, there are multiple dog breeds, each with its own life expectancy criteria.
Hence, you can't be 100% sure that this application will provide you with the accurate information you need.
With that being said, I don't think it's worth installing this program on your Mac, at least not until it adds extra conversion settings. You should either use an online conversion service or reach out to a veterinary for assistance.