This is an eraser with the face of a Shibinu.
It's called Shiba rubber.
I received this during the lesson on October 4th.
A few years ago, I asked sisters who teach English to buy one for me if they found one.
I had completely forgotten about it, but it seems they found it at a shopping mall while they were out and bought it for me.
Not only was I amazed that my sisters remembered something from all those years ago, but it was also a great gift for me as a dog lover.
Thank you, my former students and their daughters! I will treasure them.