Hard to say without knowing what makes you suspect that it has. And, come to think of it, pretty hard to tell via correspondence over a site like this, how ever well you describe the symptoms. Surely it's worth a visit to the vets?
What, like it doesn't come when called? this is not always an ears problem, - could be a legs problem. [check it's still got four] there's been a spate of weirdos hiding under cars with sharp knifes, [ask snopes]