“I came out with a piece of my heart in my hand,” Karosas told Portal Amigo Cao.

If it weren’t for the tumor on Thanos’ head, you would never know he has cancer. He still runs around and plays just like any other dog, and is happier than ever.

Follow Karosas on Instagram for pictures and updates on Thanos.

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10 of the Smartest Dogs in the World:

A friend of mine has a beautiful Dalmatian. Friendly, energetic and lovable, she was a perfect family pet… but she wasn’t the smartest pooch on the planet. See, she knew how to go through the pet door out into the garden, but she had no clue how to get back inside. It never occurred to her that the flap could swing both ways. So she would sit outside and howl until my friend would open the door.

Repeated demonstrations of the dual movement of the flap had no effect; it just did not compute. The dog breeds on this list, however, probably don’t have that problem. They’re widely considered to be among the cleverest canines in the world. Take a look and see if you agree.