the dog who saw a rainbow

i was watching this old movie called "kate & leopold"
the rest of the movie was romance,
but there was a scene that interesting.
in that scene,
a man was talking about a dog who saw a rainbow.

dogs are colorblind.

but this one dog saw a rainbow.
it fascinate the dog.
the dog told everydog about the rainbow.
but no dog believed.

how can other dog believe a dog who is as colorblind as they are?

that dog saw a rainbow.
and no one believe it.