Stella is animal aggressive and has attacked our older pit. They have been together for 4 years, and this is a recent problem. Stella has always been aggressive to dogs loose in the neighborhood or walking by the house. She is a loving wonderful dog other than this problem. She has slept in my bed for 4 years and sleeps in our laps in the evening. We need help soon. She needs a home where she is the only pet. She loves walks and playing in the yard.