I had a Doberman X who used to have a preference for plastic. I would come home to rubbish bins which had been eaten and plastic pots which had my plants were eaten. She could demolish them ,chew and eat them without any trouble. I obviously didn't let her when I was home and changed all the plastic in my garden...then she grew out of it. How she digested the stuff I have no idea but she was a strong, happy dog. This man has had his car eaten by wild dogs and about 3 months ago his girlfriend's car was pulled apart and eaten by dogs. It doesn't necessarily mean they are hungry. My dog ate really well...but she was always hungry! These wild dogs must have cast iron stomachs and be very strong.