Thank you everybody.

Her name was Morrigan. She was a mixed breed, black, very funny and energetic. Her caregivers said they did not detected anything because she was playing until her last breathe. She was intelligent and funny. I found her in a diffusion webpage six years ago, and I fell in love with her. When I was suffering for anything, she was there always.
This was the longest time I left her in a dog hotel, until I come back to Spain, and it breaks my heart thinking she will be not with me anymore.

I'm really sad with this.