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It is actually very easy to damage the trachea by pulling on a leash against a collar, especially if it is some sort of metal or choke chain collar, but it can happen with a regular collar as well. Definitely take your dog to the vet--the damage can be permanent! Your vet will probably take an xray to check for damage.
We tried the Gentle Leader and switch to the Easy Harness with our Toby to prevent injury to the trachea because he pulls when excited.