Hello, i have an Australian Cattle Dog named Rexx and he have behavioral problems like protectiveness of our house, barking(when he just wants), and whining. We are wanting another dog but we do not know if it is ok. When we take our dog for walks he loves to play with the neighborhood dogs, but when someone enters the house is is protective. We do not know if any of that will change if we can get another dog or not. If we can do u recommend and dog breeds.