Naughty Granny

The grandchildren had two grannies.
They wanted to differentiate between the grannies.
Both Grans had little dogs - as most Grannies do.
So they became known as Granny Spot and Granny Rufus.

I think I'll suggest this idea to my grandchildren - (when I eventually have them.)

.......and I'll be ready with my little dog.
I think I'll call her "Pretty".