Eosinophilic gastroenteritis in a dog
It is a disease of exclusion. Was SIBO/epi ruled out?
What food is the dog eating now?
I would use Natural Balance with a UNIQUE protein
source such as Venison or Bison.
(from the link above)
Dogs with IBD may be malnourished and have increased needs for protein and energy (3). The diet must be highly digestible and hypoallergenic; it must also be palatable and provide the energy and nutrients required.
Many dogs with IBD respond favorably to an elimination diet, which should have a single, novel protein source and a highly digestible, gluten-free carbohydrate source (1,3,4). A low fat diet is more easily tolerated, as it is less likely to delay gastric emptying (4). If the colon is affected (EGE), increasing dietary fiber may alleviate signs of large bowel involvement (diarrhea and tenesmus) (1).
Fiber increases fecal bulk, improves colonic motility, and binds water and irritants (1,4). Many hypoallergenic formulations are now commercially available. Although homemade recipes are available, they may be unsuitable for long-term feeding (3,4). Owners must be made aware that treats, table scraps, flavored medications, and rawhides may contain antigenic components and should be avoided (3,4).
Dogs with severe or refractory IBD may benefit from commercially available formulations containing starch and a hydrolyzed protein source (Ralston Purina CNM HA-Formula; Ralston Purina, St. Louis, Missouri, USA). These protein and carbohydrate sources are presented as smaller molecules and may be less likely to evoke a hypersensitivity response (4,5).