You've described pica in dogs, Sheila. Gastrointestinal disorders, dental and oral disease, central nervous system disturbances such as brain tumors or hydrocephalus, electrolyte imbalances, metabolic diseases, and toxins such as lead can induce licking, sucking, chewing, and picas (ingestion of inanimate objects), licking of owners, and air licking. Picas may also be caused by excessive restriction of calories (i.e. weight loss diets) and any medical condition that could cause polyphagia (increased hunger). Similarly, numerous medical conditions from Cushing's disease to diabetes insipidus might induce polydipsia (increased thirst). Licking, chewing, polyphagia, polydipsia, and picas can also be a side effect of drug therapy. In geriatric pets, repetitive behaviors including licking, chewing, and picas might be associated with brain aging and cognitive dysfunction.
We're going to need more clues in order to determine if Ollie has developed a medical problem or, instead, a behavioral one. Are you also seeing symptoms such as being hungrier, thirstier, acting disoriented, vomiting, diarrhea, sneezing, coughing, increased respiratory rate, pale tongue or gums, skin changes, difficulty prehending or chewing food, being "clingier" or, conversely, more aloof, lameness, a change in posture or shape of Ollie's body, or perhaps nightime restlessness and/or vocalization?