Vetmedin Dogs Side Effects Incontinence. Side effects of vetmedin include vomiting, loss of appetite, lethargy, diarrhea, shortness of breath, weakness, fainting and coughing. The following side effects may occur as a result of administering vetmedin [5, 2, 4, 3]:
Some of these rare side effects may include: Discontinue giving vetmedin and contact your veterinarian if your pet develops; Some animals may vomit after receiving the drug.