Dogs coughing badly and vomiting foaming mucus may be caused by respiratory diseases, gastrointestinal diseases or food poisoning. If the dog is underage, test strips should be used to detect canine distemper and parvovirus. If there are no other complications but coughing and vomiting, respiratory and gastrointestinal problems are more likely. If there are symptoms such as diarrhea, poor energy, and poor appetite, infectious diseases or other diseases are more likely, and you need to go to the hospital in time. examine.