Krypto, Superman's dog, is most commonly depicted as a medium-sized white dog of a generic pedigree in most comic and media appearances. However, in the upcoming Superman 2025 film, Krypto is portrayed as a terrier mutt with some standard Schnauzer likely mixed in. This version is inspired by director James Gunn's own mischievous rescue dog, Ozu, who is a mutt. Traditionally, Krypto has also been represented similarly to breeds like a white Labrador retriever, white German shepherd, or Dalmatian in various adaptations, but the breed is not strictly defined since he's an alien dog from Krypton.

In summary, Krypto's breed is not fixed and varies across different portrayals, with the latest film depicting him as a terrier mutt mix.