This is Dr. Christian. Welcome to JustAnswer. The good news with addison's treatment is that it is very effective and the problems in the blood with sodium and chloride typically resolve quickly and well once the right dose is found. You don't need to change to any special diet for this condition. It also isn't necessary to add salt or worry about the water filter. He will have enough in his diet and his body will adjust with the medication. If you have more questions please reply back.
Once the disease is under control and the medications start working well his appetite will improve. In addition, some dogs can become a little stubborn about eating dog food when they are getting the good stuff like chicken.
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