What does this dog breed called?, I'm not sure about EU or USA but if you lived in Asia or Latin America this dog is like the default skin for street dogs

Mut. Dog breeds are a recent (last few 1000 years) invention of humans. When dogs intermingle without intervention they all end up looking like dingos basically.

In Mexico, all the dogs looked the same, kind of like this as I recall.

This does also look like a red bone coonhound in part to me though but not sure.