Well, Gizmo got a clean bill of health. I told the vet what I witnessed and heard. She said that Gizmo's eyes were clean and clear, his nose was clear (nothing runny), his heart sounded strong, and his lungs sounded good. She looked in his mouth and said that his teeth looked good and that she did not see any obstruction in his throat. She had to rinse out Gizmo's mouth though. She said that there was green stuff in there (Ha Ha. Hay.). When she squirted water in his mouth, the water ran out of his mouth green. She said that he might of had some obstruction and he dislodged it by coughing. She said that if I see that he gets sick (bad eyes, runny nose, sneezing, coughing) to bring him in again and she will give him an antibiotic, but he looked healthy today. She also said that if the coughing gets worse (like there is somthing stuck in his throat) to bring him in and she would have to sedate him to get a better look in his throat. She also said that his hair/skin looks really good and that she doesn't see many guinea pigs that look as good as he does. He weighed 1390 grams. I think that is a little over 3 pounds (3.058 if I am doing my math right). I knew that Gizmo was morbidly obese!