- Pica Behaviour in the Adult Dog A common problem in dogs is the ingestion of unnatural objects such as candy wrappers, toilet paper, or socks. Not only is this behavior a nuisance around the house, but the swallowing of non-food particles poses a serious threat to the health of the dog. The problem requires attention and treatment. The Causes of Pica Behavior Medical There are many medical ...www.usask.ca/wcvm/herdmed/applied-ethology/behaviourproblems/picabeh.html