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There is no S!!!!!!!! If it was DOGS then there would be all of the letters.
Where is the 's' in your sentence alleged to have all 26 letters of the alphabet- perhaps 'jumps'is more appropriate.
Students: We have free audio pronunciation exercises.
Pack my box with five dozen liquor jugs.
Quick, brown fox jumps over the lazy dog.
Yours is not a good sentence. You will have to use this:

The quick brown fox jumps over the lazy dog.

or this:

Quick, brown foxes jump over the lazy dog.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Quickly judges bronx vamp with fez - 29 letters
It has to be 'jumps', otherwise you don't have an s in the sentence.
Oh, and

"A quick brown fox jumps over the lazy dog."

saves 2 letters!
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where is the 's'
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