Dogs evolved from wolves. They are now separate species. It’s a fact, not a theory.
Nope. Both dogs and wolves are in the species Canis Lupus and can interbreed. There is no proven speciation, one species from another, that I’ve ever seen . . .
This is a little off-topic but I always found that to be an interesting story: from what I understand, early dogs were wolves who, for some reason, were friendly to humans. And the cavemen knew enough to drive off the hostile wolves and keep the friendly ones around and breed them to make hunting partners. I still marvel, when I look at my old dog (half-shepherd, half-collie), that this at times ferocious-looking animal is safe to keep in the house.
Dogs are the SAME SPECIES as wolves.