Here's an article targeted to veterinarians about excessive surface licking:
Help! My dog licks everything - Veterinary Medicine
The conclusion is:
"A dog's excessive licking of surfaces is most likely a result of a medical condition leading to nausea or gastrointestinal distress. It may occasionally be a result of anxiety or conflict leading to displacement behaviors and eventually an actual compulsive disorder. An accurate diagnosis will require excellent history-taking skills and patience on the part of the clinician and dog owner. If the cause is determined to be primarily behavioral, treatment includes attention to the dog's environment and behavior modification in addition to pharmacologic therapy. Pharmacologic therapy is not as likely to be effective without behavior and environmental modification, and remission is likely when the drug is discontinued if causative factors have not been identified and changed."
If Dolly is licking surfaces excessively, I think that a trip to the vet is definitely called for.