My dog is coughing & trying to regergetate like something is caught in his throat. What can I give him to eat or drink so that he can puke it out?

i've gotten a std testing hiv aids test that was normal negative.. but 6 months later today i go to my new job that require a physical they looked at my throat and asked if it hurts i told them no they then said my thoat is really red and sore.. i looked at it when i got home and there's like...

The vet isn't sure what it is. Not grass or obstruction. Until yesterday she was eating, now she isn't interested. Any suggestions as to what this can be? She is on antibiotics.

"I have a small poodle mix who is normally very healthy. Yesterday he began gagging quite vigourosuly. He is not coughing. He does not have kennel cough. It's not a cough, its a gag. He's also shaking his head because his ears bother him. I put in some steroid ear drops for dogs and that helps but...