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Hi this is Dr. Hill. It is very unlikely that you did damage to his neck with a choke collar. Let's investigate what could be causing the vomiting. I need to ask you some questions.
What is his normal diet? Does he get any people food or high fat treats, such as meat, cheeses or marrow bones? Does he actively heave when he is vomiting or does it seem to just passively come up? Lets start there.
So, he may have pancreatitis (inflammation of the pancreas). This occurs when they get too much fat. You have him on a high quality food with the Mobility diet, so no need to supplement with people food. Is the vomiting an active process where his belly heaves before he throws up?