Suggestions ... this dog came to us 4 yrs ago and is now about 8 yrs old. Still sneaks and pees in house but goes out when we are watching closely. Does all bowel movements outside. Has some aggression issues. Though most are good with us now, he would be euthenized if surrendered to Humane Society and rescues won't risk taking him, so we want to do everything possible to keep him here where his home is now. We have a mini dachshund spayed female and two larger dogs that never mess in the house ever despite Harley doing it whenever he gets the chance.