Hello, I am a relatively new pitty mom. I rescued my Tank when he was 6 weeks old from people who were using his mother as bait when she went into heat to rile up the males to get them to fight. He is from a litter from one of those fights. I have other small dogs that he was raised around, a Llasa Apso mix now 7 yo and Dachshund now 12 yo. Tank is totally a mama's boy. He is very bonded to me. He is fine with my children always and the other dogs usually. He is 2 1/2 years old now and has always been protective of mommy when I am in a vulnerable state, as in sitting on the floor or lying in bed so I had to start crating him at night which worked out great, he has a big nice room with a very comfy blanket, and he seems content. Just in the past couple of months, as the Dachshund is getting older and a little neurotic, he barks at weird stuff, flashes of light, the bicycle pump, the vacuum, stuff like that. If I am again, sitting or what Tank deems as vulnerable, Tank will go after the Dachshund, the Dachshund has had to have stitches once already. It is a very violent looking occurrence and more than once my youngest daughter happened to be within inches of the tussle. I have had Tank to obedience class and socialize regularly, lots of exercise, etc. Any advice other than don't sit on the floor or stop putting yourself in a vulnerable state at all times?????