I recently adopted a dog from the Humane Society. She is about 20 lbs, and a mix breed. They say there is some JRT in her. Her name is Lily. My girlfriend, who is over all the time, has a 3.5 lb Chihuahua name Chloe. Lily at times will try to pounce on Chloe out of no where. I believe this is due to a prey drive. She doesnt seem scared. At the same time however, when both are relaxed and just laying with us, Lily wont seem to care, and will even lick Chloe. I try to distract her when she gets tense and seems to pounce, and if she does, I will send her to a quiet place with no attention for punishmetn. I am just not sure what to do with her or if we will ever be able to trust her.