I adopted a Tibetan Spaniel from a rescue, no medical history is known. The lady at the shelter said he was a couch potato. He ate some grass, and has thrown up yellow foam, with no food in it. Last night he became lethargic, and just lays. His ears will twitch as well as his face. His arms and legs will jerk, and he licks his mouth and nose. This is my first dog, so I don’t know if this is something tl be worried about. He gets excited when I offer him food, but then just lays back down. Is he okay?