Was reading the post below on small trachs - my wife and I have been battling a problem that has been diagnosed by a bulldog vet and specialist as a small trach. We have done everything we can to help the dog (now 2 years old). He has had the pallat shortened twice (once by laser then shortened by knife), he has had all of the extra skin, etc. in the back of his throat removed to clean his airway, and he has been x-rayed to attempt to diagnose his problem. Small trachea is the diagnoses. The last time his pallat was shortened they used a size 6 trach tube which i understand is not unusually small.
The problem: Every morning when he Adminses he has to be coaxed to throw up large quantities of foam which looks like and has the consistency of wallpaper paste. Very thick. Once this is done, he is a normal bulldog for the remainder of the day. The only other difference in he and a normal dog is everytime he drinks water, he throws the majority of it up and his eyes tear continuously-far more than other bulldogs we have owned.
If someone could explain to me the physics behind making this foam, i would like to know it. I understand high velocities associated with small pipes, but I don't understand what would make this saliva (I assume) so thick and pasty.