"Is that a dog?" "No, it's my pet rainbow."

"Is that a dog?" "No, it's my pet rainbow."

"Is this box a dog?" "No, it's a pet rainbow!"

The dog box produces rainbows

Dog book spews rainbow into the air

rainbow emanates out of book titled, "DOG"

Book of Dog's goodness manafests as rainbow

Secret Origin of Poptart Cat, but a dog?

Nyandoge?