I am writing because recently (in the past 4 months), my non-aggressive & very submissive 4 year old Pembroke has become aggressive. I do not know how to get this under control. There are 2 events that I believe led to this behavior. 1. I was separated from my dog for 3 months while taking care of a Visa situation. My husband took care of the dog while I was away but this is when the first of the aggression started. He is only mean to other dogs. He first growls at them and then goes for… Continue