I took him to the vet today for his 2nd set of shots and the vet said he is perfectly healthy and all is fine. However, since last night he has been coughing sort of strangely.. sort of a wet sounding cough. When he's sleeping and he wakes up a little bit it sounds as if he is almost snorting. Of course he didn't cough or make any of these noises in front of the vet. His appetite is normal, and he's been drinking water. This cough is just a little troubling to me it sounds very watery, like mucous or water is in his lungs. Any help, suggestions or ideas would be really appreciated. Thanks