As for medications, look for expectorants containing the active ingredient guaifenesin, which can bust up thick mucus, he says. (health.com)
In a recent 2017 study in the Journal of Pain Research, 77 subjects suffering neck, upper back or shoulder pain and muscle spasm were given doses of guaifenesin, an over the counter expectorant, often found under the name Mucinex or Robitussin, among others. (necksolutions.com)
If guaifenesin is not enough to control the cough there are stronger narcotic cough suppressants such as butorphanol for dogs (Torbutrol ®). (2ndchance.info)