Dogs also have lymph nodes in their neck similar to humans. The last time I heard of this I was watching my neighbors lab dalmation mix. One day he didn't really want to get up when I went to let them out. I played with them and it seemed he had very little energy. When I petted him, it seemed that he was gasping for air and he had swelling in the neck like humans do when they have colds. When my neighbors got home, they took him to the vet and found he had lymphoma (cancer of the lymph nodes). The vet gave him 2 weeks but he hung on for about 6 weeks.
I am not saying this is what your pet has but it may be something like a cold or something to cause the lymph nodes to swell and restrict airflow. Take him to the vet and help him to be comfortable.
I am not saying this is what your pet has but it may be something like a cold or something to cause the lymph nodes to swell and restrict airflow. Take him to the vet and help him to be comfortable.