Hmm if you are concerned that Enzo is dehydrated you can do a little test on him to see.
Check the elasticity of the skin on your dog's neck.. A normal hydrated dog, when you pull the skin on the top of his neck and then let it go the skin quickly goes back to normal.. dehydrated dog’s skin will remain tented after you pinch it together or it will very slowly return to its normal position.
You can try that test to see what happens. I’m sure Enzo is fine, but it might help you not worry.
Peanut isn't much of a water drinker- I mean he drinks, but just not a lot. You can try to put ice in the water.. see if that helps. However I wouldn't worry about it too much, unless you see signs of dehydration!!