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 maned wolf (Chrysocyon brachyurus) is the largest canid of South America. Its markings resemble those of foxes, but it is not a fox, nor is it a wolf, as it is not closely related to other canids. It is the only species in the genus Chrysocyon (meaning  golden dog ).