Cold
A hacking, productive cough is often present with a cold.
Flu
A non-productive or dry cough is usually present with the flu.
Information above is just a generalization of different symptoms between a cold and the flu.
The contents above are just standard guidelines and your symptoms may be different.
Dehydration can sneak up on you so always seek a heath care professional if your symptoms
are severe or last longer than usual. - - Info provided by http://www.squidoo.com.