Sophia, the Amazing Weather Doodle reminds everyone that your dogs are hot. It is well past time to get your kiddie pools out.
If you don't have one, get one!

Trainers tip: Kiddie pools can help with some confirmed diggers.
For dogs who dig and love the water, try putting your dogs toys in the kiddie pool. A lot of dogs will try to dig them out, and this will help channel your dogs energy in a proper location.

Or try giving your dog a sandbox in the shade and simply redirect them to the place that they can dig. Cooling the sand with cold water will make it a very enticing albeit messy place to be.