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I am sorry to hear about Maya's stomach being so sensitive. My name is Rebecca. I am a veterinarian and will do my best to help.
Is she vomiting, or just not eating well? How does her nausea affect her?
Any diarrhea at all?
Gagging may not be from what she is eating. How long has she been gagging? Usually nauseous dogs are not eating, and are vomiting.
Gagging can indication a respiratory problem, inflammation in the throat.
To avoid the foods she is allergic to, you could try a limited protein diet such as venison/sweet potato, or duck/potato. Limited ingredient diets are ones with only one meat and one grain/starch.
You can try Pepcid AC (famotidine; 5 mg per 20 pounds of body weight twice daily) or omeprazole (Prilosec) 10 mg per 20 pounds twice daily for nausea. Let me know what other questions you have
If she can't take Pepcid you might try the Prilosec (omeprazole).
Royal Canin and Natural Balance make lines of limited ingredient foods. Royal Canin diets can only be purchased from a veterinarian or on a website like Chewy.com (they will contact your veterinarian before shipping it). Natural Balance can be found in pet stores.
I hope you saw my last response; I have not heard back from you! Was this helpful; did I answer all your questions? How is Maya doing today?
I hope Maya is doing better and that my suggestions were helpful.