1 Canker sores are small, painful ulcers on the inside of the mouth, tongue, lips, or throat. 2  Symptoms of canker sores include small, painful, crater-like ulcers.  See a doctor if canker sores are accompanied by fever, last more than three weeks, or the affected individual has difficulty swallowing.
When people think of wolves, one species usually comes to mind: the gray wolf. The gray wolf is the largest wolf and the basis of legends. According to National Geographic, the breed was almost hunted to extinction in the lower 48 states of the United States. Even now, few exist outside Alaska.
The grey wolf (Canis lupus), or just wolf, is a mammal of the order Carnivora, and the ancestor of the domestic dog. It is sometimes called timber wolf. A recent study found that the domestic dog is descended from wolves tamed less than 16,300 years ago south of the Yangtze River in China. There are many different wolf subspecies, such as the Arctic wolf.