PLEASE PLEASE I have asked someone to help me, but no one has given me advise. I have 8 yorkies- 2 males(8 years old, neutered last year) 1 female 8 years old(brothers and sister) one 5 year old female (daughter of one of the neutered males) mother of two 2 year old females and a male and female 8 months old (different males). About a month ago, this mother has been biting her aunt who is half her size whenever we get home and they all get excited. She has drawn blood and now I keep them separate. WHY did this happen all of a sudden? They are great very sweet dogs, NEVER growled at any person and never fought within themselves (except when the females were in heat and two males fought once in a while) Please I need help, my vet doesn't know why this happens. Is this jealousy? why all of a sudden? We love them all dearly and they sleep in our beds. thanks for your advise AS SOON AS POSSIBLE!