My 11-year-old Lab mix was having trouble breathing, so I took him to the vet, who diagnosed pneumonia. But now the doctor is saying he has to have an operation to correct some trouble in his voice box, which caused the difficulty breathing in the first place and also led to the pneumonia. Does that make any sense? How could a problem with the voice box lead to labored breathing or pneumonia? I have gone to this vet for years but now fear she is trying to bilk me.