All domestic dogs descend from wolves. It's entirely possible and likely that coyotes and jackals have found their way into the gene pool from time to time as well.
Research the domestication of fur foxes in Russia to see how fast selective breeding can change an animal, then understand that we've been playing with the dog's gene pool for 10,000+ years. That's more than ample time to turn wolves into yorkshire terriers.
Many people mistakenly believe huskies and malamutes to be more closely related to wolves. This is actually not true, both breeds have been completely domesticated for hundreds or even thousands of years. People learned a long time ago that wolves make poor working dogs, they were domesticated for a reason after all. However wolves have been used in breeding programs to introduce fresh blood or certain phenotypes.
However just because huskies and malamutes phenotypically resemble wolves doesn't mean they are closely related any more so than chihuahuas are. The only reason these primitive breeds resemble wolves is because there was never a desire to breed them for specific looks, just working functionality and temperament. Physically they didn't get very far from wolves. Temperament-wise, though, they are miles and miles and miles apart from wolves and have little in common with their wild ancestors.
I've read numerous times that the breeds still most closely related to wolves are the sight hounds (Afghans, greyhounds, etc). I don't know how true this is, but understand that the domestic dog as a whole is officially classed as a subspecies of the gray wolf for a reason. The only difference, really, is temperament. Size and shape only vary because natural selection doesn't come into play and weed these traits out like they would in the wild. Feral dog populations that are allowed to revert to a wholly natural state, though, will revert to a wolf-like, coyote-like, or dingo-like phenotype.
[Add] All this talk about bread is giving me a craving for turkey stuffing.