I've been reading about your Rottie problem. Have you tried a training shock collar? It has worked wonders on my dog. Of course all things can be abused, like leaving your dog in the house alone all day. But you do need to get a handle on this situation ASAP! Obedience classes are great and should be kept up too. But a little negative response from a dog collar gets instant results! Let me know what you think! You can buy them on E-Bay.