Pool problem

Question
I have a chocolate lab who will be 2 years old in August.
The problem is we have an in-ground pool and the dog goes nuts when someone is in the pool.  She races around the perimeter until she just about falls over and is just a nervous wreck.  Even if she is in the house and she hears somebody splashing, she goes crazy trying to get out of the house.  
She swims in lakes with no problem and she'll go on the top step of the pool and bite at the water.  She defintely does not have a fear of water.
Please give me some advice, it is driving us crazy and the pool has become a source of stress when it is supposed to be the exact opposite.

Answer
Your dog appears to be either reacting to what she perceives as a threatening situation (her beloved family members splashing, yelling, in water) or is highly over excited.  The Labrador is a WATER RETRIEVER (capitals are not intended as criticism, but offered for emphasis).  The chocolate variety has (genetically) a higher predilection to over excitement.  Think about it: you are all in the pool, yelling, splashing, the dog is genetically programmed to retrieve from water, she perceives this event as alarming and is reacting with an appropriate response!

There are members of this breed who have (historically) gone to great lengths to rescue human family members from real life threatening water events.  I think what's required here is to teach the dog to PARTICIPATE.  The best approach would be most likely to teach her to "retrieve" an object FROM the water FIRST (a soft, large ball easily grasped without puncturing it) then associate it with a family member IN the water (for very large reward -- handful of special food upon reaching the ball) and then slowly add additional family members.  This seems elaborate and it IS elaborate, but changing the dog's perception about what's really going on is the ONLY way I can think of to rehabilitate her hysterical reaction.

If you require some professional help (at first) find a certified applied animal behaviorist in your area at the following site:
http://www.animalbehavior.org/ABSAppliedBehavior/caab-directory