I have a one year old Jack Russell. When we first got him he weighed 3 1/2 lbs. He would play really rough with our 9 yr old 85lb German shepherd. Now he has gotten aggressive towards her and my husband. He never is aggressive towards me or my 15lb Westie mix. He is worse at night and really bad if he's really tired. Hes very leash reactive. He goes off on people and any animal. Its so embarrassing on walks. He sounds like he's possessed when he sees people. I had a trainer scheduled to come out but she moved out of state. Every trainer in my area is crazy expensive. I don't have thousands of dollars to spend on dog training. I would appreciate any advice.