Hi, my year old dachshund (Lulu) has recently become very aggressive towards our other dogs! Her and our Chihuahua (Mya) were always friends when we first got Lulu, but now that Lulu is bigger she has started to attack her at times, I think because she is jealous. Mya is almost 5 now and not very playful, but sometimes they do play fight together and everything is going okay. But when Lulu and I play with toys and Mya gets in the way or too close to my boyfriend or something Lulu completely changes and attacks Mya, grabs her by the neck, and wont let go until we pry Lulus mouth off Mya!! It scares Mya so badly when it happens that Travis (my boyfriend) thinks if it happens again Myas heart is going to give out so we have been keeping them separated all day and night, but it is very hard as we have a small home. I'm starting to worry that he is going to say we have to re home Lulu because Mya was his dog first. Any suggestions on getting her to mellow out and stop attacking?!