My dogs avoid the pool (Yorkie, Miniature Schanuzer, and Long Haired Daschund). The Schanuzer is not the most graceful dog in the world and has fallen in the pool a few times and had to be rescused (she is a good swimmer and always gets to the swim out or the steps and waits for someone to lift her out.) The other two just don't like water....too much like bathtime I guess.
All three of them prefer to drink from the water in the potted plants around the pool!
Now my cat is a different story. He thinks the pool is his own big water bowl and when the deck jets or falls are on he thinks it is his private water fountain! It hasn't seemed to hurt him. He will drink and play with the water for hours! He doesn't seem to mind getting wet! I am expecting to see him jump in and swim any day now because when I am in the pool he keeps dipping his paws in the water like he is testing the temperature.

All 4 of them have a fresh water bowl outside and a water fountain inside. They only drink out of either of them as a last resort.