Dale Earnhardt Jr.’s dog, Killer, dies of cancer

Dale Earnhardt Jr.'s dog, Killer, lost his battle with cancer on Sunday.

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It is always a sad day when your dog passes away, and unfortunately NASCAR fan-favorite Dale Earnhardt Jr. knows that all too well. The Hendrick Motorsports driver took to his Twitter account on Sunday to let the world know his dog, Killer, had died after a battle with cancer. 

After his tweet went out, many NASCAR drivers came out to offer their condolences for the passing of Killer.