stubbornness

I am new to Doberman ownership. Mr. Jones is 17 months old and has already been in two homes, both abusive. I have always wanted a Doberman, but was waiting until I could afford the best obedience training, but Mr. Jones kind of fell into my lap. The previous owners were obviously not dog people...

I just rescued a 2 yr old female doberman from a shelter. She's not skittish or anything, but i think she has pretty awful separation anxiety. She fights with me when i crate her. She eliminates in her crate everyday. Today i found she had somehow opened her crate and proceeded to demolish our...