What kind of dog was first domesticated?

While it's impossible to say for certain, the most likely candidate for the first dog domesticated is the grey wolf.

Here's why:

* Genetic evidence: Studies have shown that modern dogs are most closely related to grey wolves.

* Geographic distribution: Grey wolves have a broad geographic range, overlapping with the early settlements of humans.

* Behavioral similarities: Both grey wolves and dogs exhibit social behavior, pack structures, and a tendency to cooperate.

It's important to note that the process of dog domestication was likely a gradual one, happening over thousands of years in different parts of the world. It's possible that humans may have domesticated other wolf species, but the grey wolf is considered the most likely ancestor of modern dogs.