I Have A Five Yr Old Male Dane Who I

I have a five yr old male Dane who I took the first of feb to have dental cleaning every since then when he eats he acts like he can't get it to go down and he starts snorting and muscles tighten up and runs out side and Gage's til he throws up not every time mainly when he eats dry food not wet food now had exrays down of throat by doc who did the dental and the also used the liquid to see on exray and said they could not find a problem gave me some pills (metoclopramide) 10mg. This has not help he still seems to run out and do as described above but doesn't always throw up