My wife has a Maltese who does not listen very well and is very spoiled. Shes does things like put her nose in the garbage when we turn our backs and (“do” use the bathroom) at home once in a while and my wife let her get away with it. We are now getting a Boxer dog and the dog will be very well be my trane as the Maltese is it. I would like to trane more stringent than the Maltese is traned but I am afraid that the Maltese bad habits to pass him. . What should I do?