Ian started hacking/gagging yesterday early evening. He was acting as if he was going to vomit, but didn't. I didn't know if he had ingested something without me knowing, or what. He loves to eat grass, so we have to really watch him during his walks. Thankfully, the vet did not find anything wrong. It's weird because at about 3:30 this morning he started making cough-like sounds, around 8a I took him for a walk, and he was fine. I still took him in to be on the safe side!