How can I stop my dogs from digging under my fence?

Mine is split because of a pool, also. Cool.

Anyhow, I gave them a sand box and every time they dug I said No dig and led them toward the box where they could.

You have two choices. First, you can pour concrete footings at the base of the fence. This requires digging a trench and filling it with concrete. It will look best if you form it with 2x4's. This isn't easy, but if its a short section it might not be too bad. The other way is to bury wire mesh under the sod from the base of the fence out a couple feet. You can do this quickly with a sod cutter. Cut the sod and roll it up. Unroll the wire, and attach it to the fence. Replace the sod over the wire mesh. In a week, the grass will re-establish, and the dogs won't be able to dig through it.

well, you could give them a sandbox or a place that is just dirt, and if that doesnt work, then get doggie nail clippers, and cut them to the quick. thats the red blood vessel that you can see if your dog has white nails. but dont cut the quick. when you do cut them, let them go, and when they start to dig, their paws get really sore really fast. after a while, they will realize not to dig cuz it makes their paws sore. hope this helps!

Go to lowes or home depot or whatever hardware store you have in your area and get some of that pet deterrent powder. Typically it is nothing more than spicy seasoning that acts as a nasal and eye irritant to them if they go messing around. People usually use it to keep animals out of their gardens.