This page uses data from the Miitopia Param Info spreadsheet, compiled by PibPasquale, Kobazco, and UglyFrenchFry.
The Doggy Doughnut is a dome-shaped, tan round doughnut with a caramelized top. It has powdered sugar in the shape of a paw-print on top and is served in a blue bowl. Strangely, this Grub along with its other rankings does not seem to have any colors based on the enemy that most commonly drops it, unlike most other Grub.