|Mane||¤ Dark gray with lighter highlights|
| Cutie mark|
Three sacks of money
According to Granny Smith's tale in Family Appreciation Day, his grandfather, Stinkin' Rich, was one of the first ponies to buy Granny Smith's zap apple jam, and started a business by reselling them. In the same episode, it was told that this had helped contribute to the foundation of Ponyville.
In the same episode, Filthy Rich appears on Sweet Apple Acres to politely confirm he will receive the first one hundred jars of zap apple jam from Granny Smith, "as usual". He is later seen giving a presentation about "Rich's Barnyard Bargains" to Apple Bloom's class that bores most of the class to sleep except for Twist and Diamond Tiara. He is again seen at the end of the episode pushing a reluctant Diamond Tiara to Sweet Apple Acres to help other fillies sing to the watering cans, part of the town elder's special process of making zap apple jam. Despite being a rich business pony and his daughter's mean spirit, Filthy is amicable to Apple Bloom, Granny Smith and everypony else.
When Granny Smith calls him by his first name, he explains that he prefers "Rich". Cheerilee initially calls him "Mr. Filthy"; after he looks chidingly at her she immediately corrects herself, and he regains his usual easy going and calm appearance.