I just killed one and it's not dissolving. I recently switched to master difficulty, if that matters. --- Children are small and weak, if one tried to attack me I could easily kill it. ~ MysticButtCrystal
Well I'd assume the soul cap would be at the amount needed to get all shouts, because afterwards the souls become useless. You can check your current soul amount in the shouts section of the magic menu.
Also Player.modav dragonsouls x (x being the amount of souls you want to add) --- Ciunas bothar cailin bainne. Tabhair dom an caca milis.