20. Sell Pet Photos

If you have a good quality camera and a keen eye for photography, a number of stock photography sites – such as Shutterstock – will happily pay you royalties for your photos.

Photography sites of this nature reach millions of people and have an enormous number of subscribers – and those subscribers want new photos (including those of adorable pets) for their own websites.

So, if your pet is photogenic and doesn’t mind holding a pose for a few moments, why not give it a try?