MUC19 is a gel‐forming mucin and is implicated in preventing caries lesions as MUC19‐/‐ mice develop twice as main lesions in comparison to wild‐type mice.31 Dental caries is not common in dogs (prevalence 5.25% for one or more lesions32) and whilst diet many play a role, the underlying physiology of the species may also be of importance. Here, MUC5AC is linked to dental caries.