Question

find error

a donkey has a sense as a horse or a cow or a camel has

Answer 1

Or we can say, "cows" are useful animals]
2)Use the indefinite article in the sense of "any" to single out an individual as the representative of a class; as,

Answer 2

A donkey has the sense as a horse or a cow or a camel has is the right answer and the error spotted here the letter "a" which comes before the sense is making the sentence a wrong one.  

Meaning for the word sense:

Sense is nothing but intelligence to understand and recognize or react to something, so the letter "a" was removed from the sentence and replaced with the word "The" to make the sentence error-free.