Hi, As I posted on the introductions thread, I rescued 2 small breed dogs, 4 years ago ,a toy poodle who was 3 mths, and 2 years ago,a chihuahua who was 4 months old. Having always lived with,trained and rehomed German Shepherds, I do understand, the pack,the hierarchy and dog behaviour, Im now quite stumped as to what to do for the best and hope maybe someone can give some insight. My poodle readily accepted the Chi into our household 2 years ago, but in the last 6 months his behaviour has become quite aggressive towards him but only in certain ways. If I give the boys a treat, the poodle will not eat his but guard it until the chi comes within 6ft of him, then he will attack him, the chi always responds by immediately flipping onto his back and urinating, which I know to be submissive signals, yet the attack carries on. This scenario also plays out with toys, the front door, the dog flap and the car. The chi is understandably tiptoeing around the poodle in fear and nervousness,walking only around the edges of rooms and clinging to my side. My first instinct when it started was that it was the pack sorting its hierarchy, but now there really is no reason as the Chi always defers and submits readily to the poodle and is not a challenge to him . My poodle is highly intelligent and actually sets up the chi to initiate an attack, such as placing an object on route to the front door, the barking as if someone is at the door, then jumping out on the chi as he passes the object en route to the front door. So far, the attacks have not resulted in any really bad injuries to the Chi, I will always step in and correct the poodle, but the Chi has become very nervous and I really dont like the way he continues to be attacked when its so plain to see, he offers no challenge,doesnt fight back and is now too scared to accept treats or to play with a toy, Ive tried not giving treats at all,putting away the toys, but the poodle will always find something to challenge him on. when it happens, I remove the poodle from the attack and say No! I try to anticipate the attacks and wait until hes just about to do it and tell him no! but it just seems to have made him more determined to do it when my back is turned. Both boys are neutered ,healthy and I show no preferential treatment to either, nor do I carry the Chi around or "baby" him,the poodle shows no aggression around any other dogs or people, any ideas as to why hes doing this please?