Are you really sure you want your dog in the pool? There are safety issues and Golden hair in the filter to think about.
If you do want to do it, the first thing I'd work on is making sure the dog knows how to, and can get itself out of the pool. If the pool has built in steps in the shallow end this should be no problem. You can walk the dog in and out a couple times and if it likes the pool and sees people and/or other dogs jumping from the side it will probably try jumping in itself or you can get in and encourage the dog to jump to you. If you don't have shallow end steps, the dog is going to have to pull itself up over the side to get out, which some dogs can't do.
Some time ago there was a video posted of a mother dog running back and forth frantically at the side of a pool as her pup was struggling to stay afloat. She finally grabbed the pup by the scruff and pulled it out.
Sunfire's Amazing Grace, CGC, Pet Partner therapy dog, 9/12/2013 Zoe
, Rockwall Nantucket Breeze, BN, CGC, Delta therapy dog, 5/4/2008 - 10/28/2013 Zeke
, our introduction to the world of Golden Retrievers, 6/12/1997 - 12/18/2007