Thank You all for posting!
Well I was right, I know my dog very well !! She did it. Yesterday, 5 days after the chickens went missing with no trace, I saw my dog Ocea running though my garden with a chicken in her jaws. I called her named she looked at me dropped the chicken and took off running. Didn't she her for the rest of the day. It was my chicken, she has stashed them somewhere in the yard. I think I'm done trying to raise chickens this year. Thank You All !