The way we feel about another person, or about objects, is often bound up in associations that have no direct connection with the person or object at all.
In science-fiction, as in all categories of fiction, there are stories that are so outstanding from the standpoint of characterization, concept, and background development that they remain popular for decades.
The gifting of animals with human speech is scarcely an unique idea; the idea of a talking horse goes back at least to the siege of Troy, for certainly there must have been some dialogue amongst the Greek warriors enclosed in the wooden horse's belly.
Many writers of science fiction, who have not given the matter much thought, assume that a man of intelligence from one planet would meet a cordial and sympathetic welcome on another world.