Canned pumpkin, a few tablespoons a day as a treat will help keep your dog regular. You might want to switch to a food that's higher in fiber, too. Truly, most dog's don't get constipated. Is it straining to go and nothing is happening or straining to go with diarrhea? Either case, fiber is the safest solution.
As a home remedy, you can give your Springer raw meat, natural diet and fiber to help deal with constipation. It would be advisable to get in touch with a vet to determine the cause of the constipation.