Gromit is generally considered to be a beagle , at least in-universe.

What kind of dog is Gromit?

  • In the Wallace & Gromit stories, when people ask what breed Gromit is, Wallace answers that Gromit is a beagle.
  • Many character profiles and fan discussions also describe Gromit as an “anthropomorphic beagle,” emphasizing his intelligence and thoughtful personality.

Why he doesn’t really look like a beagle

  • Gromit’s physical design is very stylized: plain light-colored body, simple ears, and minimal markings, so he does not match the typical floppy‑eared, tricolour beagle look.
  • Nick Park’s design choice was to make Gromit visually simple and expressive rather than strictly accurate to any real-life breed.

So what’s the best answer?

  • Officially in the story world, he’s a beagle, even if his appearance is closer to a generic cartoon dog than a purebred.
  • Some fans argue he resembles other small terrier types more than a beagle, but this is not supported by the creators’ own descriptions.

TL;DR: Gromit is canonically a beagle, just drawn in a very simplified, cartoony style.

Information gathered from public forums or data available on the internet and portrayed here.