What does this sound like to you....could blood be in the lungs?

My moms little dog is not doing so great right now. Ill just tell you the story. 2 nights ago he started this coughing sound and then yesterday he begun to spit out blood as he was coughing. It scared us to death and called a emergency vet and he took us in right away. He said there was nothing stuck in his throat because thats what we thought at first like maybe he ate something. His temperature was 103 so he was concerned about that. He gave him a shot for vomiting and then gave him some antibiotic pills...And then sent us home!!! I wanetd to get a x-ray because I really did think yesterday he had something stuck in his throat or wind pipe. Well today.....its totally different the wya he coughs makes me think he has blood inside his lungs. He has not puked blood up today thought thankfully. But it sounds like he has blood somewhere in him....Do you think someone like a neighbor may have kicked him and caused internal bleeding? I am very worried about him and been crying even though he is not my dog. Tomorrow were going to call the vet again and see what else they can do for him. What does this sound like to you? He did drink some water today and ate a little bit of canned food this morning to take him pill but now he won't eat anything. I am really worried about him.