"Richest dogs in the world"

From Dogtime:

Who is the richest dog in the world? How much could the richest dog possibly be worth? We've compiled a list of a few of the best known, wealthiest dogs from around the world. The saying, "A dog's life" takes on a whole new meaning once you've made the list of the richest dogs in the world!

Gunther IV

Countess Karlotta Libenstein of Germany left approximately $106 million to her German Shepherd, Gunther III in 1992. Her trustees invested the money and tripled the fortune. When Gunther IV was born, he officially became the wealthiest dog alive. It has been reported that his fortune has grown to more than $372 million.

Toby Rimes

The Poodle inherited $80 million from New York owner Ella Wendel.

Trouble

Leona Helmsey left $12 million to her dog Trouble. Helmsley's brother Alvin Rosenthal has been appointed guardian of the white Maltese Terrier until it dies, when it will be buried beside Helmsley in a mausoleum in New York State.

...MORE

It was the recent demise of Trouble that sparked the search. From the WaPo's blogPOST:

Trouble, Leona Helmsley’s millionaire dog, dies at age 12