Hunted Meat Of Dogs And Their Nature
Are you mentioning regurgitation? if yes, then cows and other cattles also do it. The vomiting happens due to indigestion which mean it is not been taken care of. A trained dog will be trained to avoid it. Btw I disagree with your statement that fitrah consider dog dirty because it eat vomits. Perhaps @Irfan76 sb can give better response.