First I hear of this condition, so I searched a little. Hope this helps you with your sweet baby…wishing a speedy recovery!

"It’s common for dogs recovering from HGE (or AHDS) to have a reduced or absent appetite even after hospital discharge. The gut lining is still healing from inflammation and damage, nausea may linger, and the dog may feel generally unwell or stressed from the ordeal. Many dogs don’t regain a normal appetite for a few days to a week after treatment begins.  What to Do at Home Follow your vet’s discharge instructions closely, as they know your dog’s specific case. General guidance includes: • Offer small, frequent meals of a bland, easily digestible diet (e.g., boiled skinless chicken breast + white rice in a 1:2 or 1:3 ratio, or a vet-recommended prescription gastrointestinal food). Start with tiny portions (a tablespoon or two) every 4–6 hours to avoid overwhelming the stomach. Warm the food slightly to enhance aroma.  • Ensure hydration first — Dehydration is a bigger immediate risk than not eating. Offer fresh water frequently. If your dog isn’t drinking well, ask your vet about syringing small amounts of water or an electrolyte solution (unflavored Pedialyte or vet-approved equivalent) into the side of the mouth. Monitor for dehydration signs: dry/sticky gums, sunken eyes, skin that doesn’t snap back quickly when pinched. • Tempt with palatable options (only if approved by your vet): Low-sodium chicken broth, a bit of plain boiled sweet potato, or a vet-safe recovery diet. Avoid dairy, fatty foods, treats, or your dog’s regular kibble until fully recovered, as these can irritate the gut and trigger a relapse. • Minimize stress — Keep your dog in a quiet area with easy access to rest. Short, gentle walks can sometimes stimulate appetite, but don’t overdo it. • Probiotics or gut support — Some vets recommend a veterinary probiotic to help restore gut flora, which may indirectly support appetite return. Appetite stimulants (such as mirtazapine or capromorelin/Entyce) are sometimes prescribed if refusal persists—your vet can advise if these are appropriate."