Millionaire Pets: Richest Animals In The World (INFOGRAPHIC)

These pets are millionaires, and they have the diamond collars and mini-mansions to prove it.

The fortune recently left to Tommaso, a cat in Rome owned by an heiress, sparked a newfound interest in wealthy pets. Tommaso's rags-to-riches life made his story even more compelling.

ABC News reported in December that Tommaso's $13 million inheritance makes him the third richest pet in the world, and he is left also with properties in Rome and Milan.

But while some pets may be rolling (sniffing, gnawing, napping) in money, millions of other pets around the world are struggling to survive. The Humane Society estimates that 3-4 millions pets are euthanized each year in the U.S. alone. If you're interested in helping a pet in need of a home, consider adoption and visit Petfinder.com or ASPCA's website to learn more.

Check out the infographic below provided by visualy.ly of millionaire pets:

by visually via