Stew has a cough which hes had since 8 got him around 2 months old. Hes now 6 months. Now i have had to worm him just finished 10 days of treament about 1 week ago. when he coughs he then chrws his cud. Could this be just him coughing up his cud or could he still have lung worms? Should i treat him with another round of v?