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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
Has Rival shown any signs of diarrhea? Has he had any deworming treatment recently?
He may have a sensitive digestive system, and inflammation to the lining of his stomach may build up over time. In these situations I would advise feeding a light diet for the next few days - plain boiled chicken and rice, a little scrambled egg, plain white fish or light cottage cheese. This can help take the strain off an irritated stomach and help things settle down. Giving ranitidine (zantac) 2-3 times daily as an antacid approximately 1 hour before his meals can help things settle down too. It should be available over the counter at most pharmacies. For a 12lb dog I would recommend a dose of ~10mg 2-3 times daily. You should be seeing an improvement over a few days. At that point, you can start to re-introduce his normal food.