Makes my Senior dog cough

The product worked for both of my senior dogs, however one of my dogs, a 13 y o westie mix starting coughing this terrible dry hacking sound. I stopped giving him the additive and the cough cleared up after a week. A month later I gave him the dental fresh again and he starting with the coughing. Poor dog. needless to say, he won't be getting anymore of this. My other dog an 11 y o shitzu mix was fine.

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