I probably am thinking too much like a human...
...but her actions make sense to me in the way that she is hoping to lure her friend back. First treats at the backdoor (come in! come back!) and then putting treats in her friends' favorite places (when my friend comes in, he can go to his favorite place and rest there with a treat!). When her friend still did not appear, maybe she decided to up the ante to prized human foods - or, it became a habit and just something she found interesting to do which would take her mind off his absence.
Anyway I wouldn't be too hard on her, poor girl, but just end her access to the pantry and gently let her know somehow that I don't want pizza in my bed...and could you give her some extra play/attention/training to help her through this stage? Maybe go for walks with another friendly dog, etc? (Hopefully it's just a stage and she will accept that her friend isn't coming back, and her behavior will become more normal again!)
Then again, maybe I am being too harsh...few wrapped snacks/fruit bars on chairs and in beds is no big deal! But pizza/pizza crusts seems unsanitary, so I would at least end access to that...(as a mom of teens, one tends to develop "food hygiene rules"...)
Sorry for your loss!!
Rumo ~ rescue shepherd/husky mix
Last edited by GSDchoice; 04-06-2019 at 08:26 AM.