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Hi, this is Dr. Gabby.
You could try human vanilla ensure drink.
Or even better would be dogsure drink.
To help with the vomiting try 1/2 of a 10 mg pepcid ac tablet every 12 hours.
There is also a paste called nutrical. It is high in calories and vitamins. They sell nutrical at petsmart and online.
I hope that helps. Do you have any additional questions?