My dog has this issue and it’s been a combination of getting him on the right food as well as removing allergy triggers (air fresheners and wall plugins). Another huge help was getting him on prescription food. Ask your vet about Hills Low Fat ID. I tried that same Hills science diet food your dog is on for my dog and he had gulping fits on it. I think it’s too high in omega oils. If I put my dog on ANY other food he has an episode. Not sure what this food does for him but he has hardly had any episodes since getting on this dry food diet. If I give him anything high in omega oils he has a gulping fit. I have found that if he has a fit the best thing I can do is let him graze outside until he stops. This usually lasts 20-30 minutes of him just chomping grass or weeds and then he is ok. It’s better then him eating carpet and socks (he threw up multiple socks one day which was scary!) and hurting himself. This is a mystery Illness and it’s really trial and error in making them comfortable. 😕
