This is what happens when you ponder idioms, common sayings and phrases too much.
The loyalty of dogs are known
Just like black cats are devil’s kin
A fox is clever, pigs are foul
Wolves they can don sheep’s clothing
Such different sayings that we have
Born from some idle observation
Yet how much truth lies in them
Can we trust that first observer?
What is that makes sayings stick?
And certain ideas turned into truth
In some cases lies are made
And propagated in our modern times
When you find an idiom,
Some wise saying or what not
Something that seems so much like truth
Take it with a hefty pinch of salt