It's easy to normalize and thus miss signs that a dog may be in pain, such as the "funny" posture that this Pug displays when sitting. In reality, the dog likely has discomfort in her back, hops, and/or knees that make sitting in a more conventional way too painful. Behavior problems such as anxiety or aggression are commonly diagnosed in pet dogs, and, as many dog owners have discovered, can be quite challenging to fully resolve.