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We have been giving collagen to our elderly yorkie Beau and it has really helped his collapsed trachea. He was coughing and gagging all the time and it was like he was going to pass out. You have to give it a little time, but the collagen does work. It really improved his symptoms. The one we are using is called Ultra-Flex Collagen https://www.askariel.com/Collagen-for-Pets-p/154.htm It contains NEM natural eggshell membrane which is a form of food-based collagen.