Yeah, there’s never a hard dividing line between a species and its immediate predecessor. Merely a gradual chain of mutations that eventually results in distinct populations. If those populations can’t successfully interbreed even if transported to meet, they’re different species. The definitions for asexually reproducing organisms are even more fuzzy. This concept that taxonomy doesn’t have fixed divisions confuses a lot of anti-evolutionists.

The proto-chicken was a mutant Red Junglefowl. Just like a proto-dog was a mutant wolf.