Here you can read and hear and see the famous poem performed by mister Data himself.
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The poem, audio only The poem, videoclip from "Schisms"

ODE TO SPOT by Commander Data

Felis Catus is your taxonomic nomenclature,
An endothermic quadruped carnivorous by nature.
Your visual, olfactory and auditory senses
Contribute to your hunting skills and natural defences.
I find myself intrigued by your sub-vocal oscillations,
A singular development of cat communications
That obviates your basic hedonistic predilection
For a rhythmic stroking of your fur to demonstrate affection.
A tail is quite essential for your acrobatic talents:
You would not be so agile if you lacked its counter-balance.
And when not being utilized to aid in locomotion
It often serves to illustrate the state of your emotion.
Oh Spot, the complex levels of behavior you display
Connote a fairly well-developed cognitive array,
And though you are not sentient, Spot, and do not comprehend
I none-the-less consider you a true and valued friend.

(Star Trek: The Next Generation, episode "Schisms")