Ogden Nash was the first person to characterize a dog as "man's best friend." It is in fact the first line of "An Introduction to Dogs"
An Introduction to Dogs
by Ogden Nash
The dog is man’s best friend.
He has a tail on one end
Up in front he has teeth.
And four legs underneath.
Dogs like to bark.
They like it best after dark.
They not only frighten prowlers away
But also hold the sandman at bay.
A dog that is indoors
To be let out implores.
You let him out and what then?
He wants back in again.
Dogs display reluctance and wrath
If you try to give them a bath.
They bury bones in hideaways
And half the time they trot sideaways.
They cheer up people who are frowning,
And rescue people who are drowning,
They also track mud on beds,
And chew people’s clothes to shreds.
Dogs in the country have fun.
They run and run and run.
But in the city this species
Is dragged around on leashes.
Dogs are upright as a steeple
And much more loyal than people.
Well people may be reprehensibler
But that’s probably because they