I have a male 4.5 year old Shiba Inu. Inside the house or on a leash he is very obedient. But, as soon as I let him out,in our fenced in backyard, he will not come when called. It is so aggravating. How can I get him to come in when I call him? Treats dont work. Squeaking a ball doesnt work. Calling his name doesnt work. Going to get him doesn't work. I need help.... Any ideas or suggestions? Shibas can be defiant and are extremely smart.