I have an 11 yr old chihuahua mix, part Pom/hairless chihuahua. For 5 yrs he has been on heart meds for murmur and lasix. Had him to the vet a month ago for rabies and boosters; he was also coughing a lot. Tried allergy meds and cough meds...no change. Vet xrayed for collapsed trachea. Heart … Read more