Some dogs were domesticated by 33,000 or more years ago, but the Ice Age disrupted the process.
The dwindling of the world's lions, wolves, sharks and other large animals isn't just sad, it's having far-reaching effects on ecosystems.
The 1,300 gray wolves in the Rocky Mountain region are considered recovered and are losing federal protection.
Language slipped into the budget bill has removed an animal from the endangered species list for the first time.
Most other prehistoric pooches were much larger, which raises questions about the French dogs' origins.
Remains of the Husky-like dog, buried 7,000 years ago in Siberia, suggest people saw it as a thinking, social being.
A canine cancer is found to be able to repair itself by tapping the infected dogs' own cells.
A canine cancer is found to be able to repair itself by tapping the infected dogs' own cells.
A dog jaw bone fossil found in a Swiss cave may be the oldest evidence of human-canine companionship.
Gorillas and other African great apes play tag, which suggests that this common childhood game has deep primate roots.