What type of substrate are you using?
Dragons over a year do not pass stool dail like when they are young. It is not unusual for them to go up to two weeks at a time, because the animal protein is less. The Veggies should be at 80% and insects at 20% after a year old. If you get really concerned, you can take a little baby food prunes and drop a little on the snout and allow the Dragon to lick it off. This will usually get things going.
I would continue with the soaks and swimming is great to help get the bowels going. This is a link for a food chart to help you along: http://www.beautifuldragons.com/Nutritionframeset.html
This is what I consider the best diet: You should be feeding Collard greens, mustard greens, dandelion greens, escarole and curly endives. Butternut squash and various berries are great for a treat. The Veggies should be put in fresh daily, and done about an hour after lights on. They need 80% veggies daily and 20% live prey over a year of age.
The live prey should include crickets, silk worms, roaches, goliath worms and phoenix worms.The canned prey looses the nutritional value and is high in chitin which is the outer shells and can cause a blockage.
Super worms and wax worms are like giving the Dragon candy. All veggies and prey should be dusted with calcium daily 5 days a week and vitamins 2 days a week.
If the Dragon still is having some problems after a few more days and the prunes, then you may need to have the Dragon into the Herp Vet to be checked out for parasites and other possible issues. I can locate a Herp Vet with a State. Joan