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