My daughters sick today. While we are waiting for her appointment, I read her the first spot story arch (The Tower, A mother's Love, The return of the Blind Swordpig) in UY Book 3. At the end, she started crying a little bit.
"I like spot and I'm going to miss him."
"Well, he comes back again in a later story."
"Yes, but probably not for a while."
SPOILER Alert!
I guess I better not read book 4 to her or she will seek Mr. Sakai out and call him some bad name for killing spot.

I have to say, every time I read a "A Mother's Love" it moves me. One of my favorite Usagi stories.
Peace, maka