WiFi does NOT have a cord. It's wireless. That's what WiFi is all about.
Now did your dog chew up one of the cables connected to your router? If so, which cable did it damage? The lights on a router show different things. Which one is blinking red? This gives you a clue as to where the problem is. If it is the Internet light, it suggests that the connection from the modem or the ISP cable has been damaged.
Can you access the router's configuration pages? If so, then the router is working and getting power, which supports the fault being in the Internet connection. Since this connection to a router is absolutely nothing to do with WiFi, you are confusing everybody by calling it a WiFi cord.
Including detailed information about network problems rather some very vague potentially incorrect statements will help you get a valid answer.
What you should do is take the damaged cord/cable to your local computer shop and ask them to sell you a replacement.
I hope this helps.
Replace the cord that the dog chewed up. If you have power but no other lights, it sounds like what the dog damaged was not the power cord but the network cable.
get a new cord.
then, get rid of your wi-fi cord eating dog.