Frayed power cord, need help!

Hi there, I have a frayed power cord. I have no idea how it got that way. I do have a dog, maybe she chewed on it, but it has been working, I just happened to notice it now. Is there anything that I could do, or should I just order a new one? I'm afraid to use it while it is frayed, but also don't want to be without a laptop. Thanks for any suggestions.
