Thanks you guys. I love this dog, and he'll do anything I ask of him.

Happy, I taught Jack this, and my MOST stubborn little Jack Russell girl, Mini using different methods.

1) Shaping. Shaping is good for a dog that knows HOW to learn. Dogs that offer behaviors and understand if you reward something, they should continue and expand what they did to get the reward.
So I set the bowl up in front of Jack, empty. As soon as he stuck his head in the bowl I click/treat. Did that a couple times. I put water in the bowl and as soon as he put his head in the bowl I clicked/treat. Then I waited for him to actually stick his nose in the water before I click/treat again. Then I only click/treated when he left his nose in the water and blowing out. I didn't say anything the whole time. The whole process took less than 2 minutes.

2) Mini's way. For dogs who don't offer behaviors.
I put the filled bowl in front of her, dropped in a piece of ham that sunk and encouraged her to get it. As SOON as her face went in the water I click/treated, so she pulled her head right up leaving the piece on the bottom. Did this many times. Every time I encouraged her to get the treat, I'd say 'Blow Bubbles', so when I removed the treat from the bottom, I still pointed and said blow bubbles. As soon as her head dipped in the water with no treat she got a jackpot. She understood after that.