Actually today my dad was working in the backyard and going back and forth from the yard to the garage so he was leaving the gate open. He said, "if the dogs need to go out either tie them up or walk them". Well Astro had to go out so I tied him out. My dad went into the garage and I heard Astro crying (he always cries when he can't see anyone). A few minutes later, I still heard him crying except a lot louder. I was thinking to myself, "boy he cries really loud". Something told me to look outside and there is Astro, sitting on the deck crying at the door for someone to let him in. He still had his collar on and I checked the leash. I still have no idea how he got loose.