I rescued a 6 yr old pom about 2 months ago. I had his teeth cleaned and 5 pulled. He had his shots, heartworm test and pills, he also had small little tumor that was opening and bleeding removed. His appetite is great but he coughs here and there like a croup or hair in his throat. Not too often but usually when he is bored. should I be worried?? I also tested his stool for parasites and none were found.