The psychology of small dogs: I read this on the 'net' so it must be true.
There are a number of behaviors that are common to small dogs acting dominantly, so much so, that this type of behavior observed in smaller breeds, has inherited the label ‘small dog syndrome’ or ‘little dog syndrome’. Some of the common behaviors that characterize ‘small dog syndrome’ are listed below.
Your dog has developed the habit of sitting on you, or jumping on you, or next to you, when he pleases.
Your dog does not allow you near him when he is eating or has a toy he is playing with
Your barks excessively to get your attention.
Your dog is over protective when other dogs or humans come near you.
Your dog growls when you attempt to move him from his favorite resting place.
Your dog is generally stubborn and refuses to follow commands given to him.
Your dog displays an exaggerated reaction to being left alone, characterized by constant barking, or destructive behavior.