I don't want to scare you but my dog had the same thing and I didn't realize how serious it was. I should have noticed that she had been losing some weight and didn't seem to have the energy she used to have. She was 9. I finally took her to a vet and he said she did have cancer of the windpipe and if I didn't do something she would eventually suffocate to death. They did surgery and she lived another 1-1/2 years. They said surgery wouldn't cure her but would extend her life. I finally had to put her to sleep but I made sure she was very happy during the extra time she had. Sometimes I think I should have just put her to sleep when diagnosed because when the cancer did come back it came back with a vengence. Now, maybe that is not the case with your dog (I really hope it isn't) but if it is what the doggie has, the poor thing is probably miserable. Please tell them to get the dog to a vet asap. Dogs are like our family and should be treated as such. If one of our family had something suspicious, we would take care of it asap. Please have them give the same help to their 8 year old lab. If she does have cancer, she is suffering, believe me.