My Abs was a potato chip freak-she just KNEW that the bag of chips were bought just for her. I could leave meat, cheese any and all groceries in the car with either dog (Cyn-the brown dog is a kelpie cross and Abs was a lab-we lost her in July) or both and they never got into things--but with chips, Abs would take the bag out of the sack and lay it on the front car seat for me to open and then hang her head over until I fed her chips. She never opened the bag herself, but made sure I knew that was my job and I needed to do it NOW!! Mom!! She had been good and waited int he car and now wanted her reward!! Loved that dog and miss her terribly.