Dogs with vestibular disease feel extremely dizzy and get sloppy feeling of motion sickness. They may lose their appetite and will refuse to eat or drink. Here are a few tips to feed a dog with vestibular disease:
Keep their food in an elevated place so that they need not drift down while eating or drinking.
Keep their food and water bowls as close as to the wall and that would prevent them from falling forward.
You can switch to easily digestible food till recovery.
Use a harness until they become all right.
Give them plenty of rest and do not persuade them.