En

En is Yuya Sakaki's pet dog in the Yu-Gi-Oh! ARC-V anime.

Appearance
En appears to be a [[wikipedia:

Etymology
En's name along with Core's forms the word "encore".

History
En was found on the street by Yoko Sakaki. When they were found, they were big enough to fit in the palm of Yuya's hand.

Yu-Gi-Oh! ARC-V
After waking up from a dream, Yuya exited his bedroom to be greeted by En and Core. Yuya picked En up and reminiced about when En was a puppy, also noting that they have got a lot heavier since they were a puppy.