Thanks for the additional information, JACustomer. I'm sorry for the delay, I did not get a notification from the website that you had responded.
It sounds like your dog sitter has tried a lot of different options for him. Stress only makes a dog who already isn't keen on eating well even more unlikely to want to eat their food.
There are a few things that can be done at home to see if we can make him feel better. The first thing is to administer a dose of regular pepcid (famotidine) every 12-24 hours. You will want to give 0.5mg/pound of body weight (a 10# ***** would receive 5mg, a 5# ***** would receive 2.5mg, etc). The dog sitter can buy the brand name Pepcid, or you can use the cheaper, off-brand “famotidine” that’s available. Either will be useful. This will help to reduce the acid in the stomach, if this is a concern, and should give him an appetite.
2 hours following a dose of famotidine, the time needed for the medication to begin working, they can offer a bland diet. To make this, they'll combine white or brown rice, boneless, skinless chicken breast and sufficient water for cooking in a stock pot. Boil on medium until it turns to mush and the breast is easily flaked.
They can also try feeding chicken, chicken and rice, pumpkin, squash or turkey pureed baby foods to see if this will entice eating. Satin balls are another option: http://www.njboxers.com/satin-balls-recipe.html
If these don't work, I would recommend a visit to a vet to be sure that there is not a stress-related condition that is causing issues for him including pancreatitis.
We should begin to see stool again once a pet begins to eat regularly, so expect that 2-3 days follow the onset of him eating again the bowel movements should begin again.
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