What could cause a brown vertical line and horizontal ridges on one side of only one fingernail? Dr. Richard Zimon Dr. Zimon More info needed: Sounds like you damaged the nail bed at some point in time.
As tigers are related to cats it would mean that mean that they are feline. A canine is a dog so tigers aren't canine. 2 people found this useful.
Some other wild felids such as tigers do it, horses, donkeys, cattle and a whole slew of other wild ungulates do it as well. The horses and cattle are much more dramatic in their flehmen behavior; they curl their upper lip back on itself, open their mouths and lift their heads to the sky.