Grim

Before his "death"
Grim was DanTDM's dog. Grim is a skeleton dog, hence his name Grim. Grim's first appearance was in the video, "GRIM'S TALE | How I Met Grim The Skeleton Dog | Minecraft" Grim was a birthday present that Dan received on September 11th ''"A Few Years Ago." ''Grim was given to Dan by Dr. Trayaurus. Dan says that he was the best birthday present he had ever gotten.

How he became a skeleton
After a long day of adventuring with Grim, Dr. T says that he has an idea, so the go check it out. After Dan goes and find him, he finds out that it is a cloning machine.

Dan admits that it looks unstable, but Dan suddenly gets struck with the idea to clone Grim with the machine. Grim gets in the cloning machine, so Dan presses the button. The room flashes with bright colors, then a loud bang is heard.

Dan opened the door and shockingly sees two bones lying on the ground were Grim had just sat. Dan was angry at Dr. T and says that day was the worst day of his life.

The next morning, Dr. T bangs on Dan's door and shows him a new machine that can bring Grim back. Dan places 7 bones on a block and presses the button to the machine. It flashed color again, and a loud bang was heard...again. That bang was supposedly lightning.

Next, sat Grim on a little Redstone block. Dan was amazed to see Grim back in skeleton form, and Dr. T became Dan's friend again.

After his "death"
Dan says the day he came back to life was the best day of his life. Dan says after that, he and Grim went on many weird adventures together and lived a happy life.

Trivia

 * Dan says "Bones" a lot in that video. That unintentionally refers to his Minecraft Hardcore series, where Dan has a dog name Bones that the viewers wanted to be named Grim.
 * The mod used for Grim is unknown.
 * Grim isn't seen on his channel anymore.