Even post recovery, pups remain nauseous due to the strong medications that were given to them. You can start by given them fluids through droppers or syringes (https://www.dogspot.in/heres- how-you-can-administer-medicin es-to-your-dog/
). Your vet will be in a better position to help you with the schedule of feeding liquids. Gradually you can proceed to boiled liquid food.
Do connect with your vet for a complete understanding of what fluids can be given to your pup.
We wish your pup a speedy recovery!