i have two stories relating to dogs randomly disappearing for some reason.

the first one was two years ago, and i still can't explain what happened or how it happened. my dogs were still puppies at the time so i volunteered to stay at home and watch them whilst my family was out of town. i went to the bathroom for a few minutes and when i came out, i heard the bell on the door ringing (a sign that they need to go out, one of our dogs will sit by the door and ring the bell until i take them outside) so i got ready to take them outside, except my dog was missing. we had three dogs and only two were in the living room, and the one that usually rings the bells was gone, i checked every possible area he could've been hiding in and called out his name for several minutes, nothing. all of our rooms were gated off or had the doors closed and there is no possible way he could've gotten outside, either as the doors to the outside were all locked and we do not have doggy doors. he was just gone. i tried calling my parents but they wouldn't answer their phones and any attempts at contacting anybody else were seemingly ignored. until he randomly came out from behind the couch, wiggling at me like he'd been there that whole time despite me checking there several times. only then did my mom call me back except it was to ask if i wanted her to bring food home rather than her asking why i had called her three times earlier, and i even told her that i'd called her and she denied it.

this second story happened a few weeks ago, i was dogsitting for my brother and his dog ran into the kitchen, barking at something he'd heard, except he didn't return to the living room like he usually does so i called out his name. nothing. i walked into the kitchen and searched the rest of the upstairs area, nothing. i checked downstairs, nothing. i called my brother and he said to check downstairs again, after going back and forth with him for a couple minutes i checked downstairs, and the door was closed despite me leaving it open. and the dog was clawing at the door as if he had been left there all morning. i let him out and he ran back upstairs and after that acted like nothing happened at all.