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While he may not have megaesphogas, some of the same techniques used for megaesphogas may help stop or lessen the incidents of vomiting.
Id try and keep his front elevated for 10-15 minutes after eating as well as when he is eating. You can get a set of narrow stairs and put the bowl at the top so he has to eat with his front elevated. It can be tricky to keep the front elevated afterwards, but taking the time to maybe pet or massage his front after eating may keep the food down in the stomach long enough to keep it from coming back up. That is one thing that can help.
You should also experiment with different consistencies of food. Some do better with almost a liquid consistency and others a semi liquid or softened food. Feeding a high calorie diet in small portions throughout the day is also recommended. Perhaps supplement with Nutrical would help as well.
There are a few different drugs that may be effective. One is Metoclopramide which you are already using and can read about here:
Another drug is Cisapride, you may want to ask your vet whether this drug would help in your dog's particular case if the reglan isn't helping much. Hopefully your vet has also suggested a probiotic as well such as fortiflora. See if the elevation helps and perhaps the change in meds and probiotic. It may take a little time for the probiotics to help but the elevation should help pretty quickly. Be sure to feed high calorie, small meals more frequently.
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