Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner. If you would still like assistance, can you tell me:
Any retching, gagging, lip licking, drooling, or diarrhea?
Any changes to his thirst?
Are his gums nice and pink (not white/pale)? Moist or sticky?
Any changes in his mouth (ie redness, sores, lumps, etc)?
If you press on his belly, does he have any tensing, tenderness, discomfort, or pain? Any discomfort elsewhere?
Could he have eaten anything he should not have (ie bones, toys, plants, chemicals, human meds, etc)?