I'm no expert either but my girlfriend works at a vet clinic (and is applying to animal behaviour PhD programs) and my impression from talking to the vets is th

I'm no expert either but my girlfriend works at a vet clinic (and is applying to animal behaviour PhD programs) and my impression from talking to the vets is that most dogs are very food motivated but they are also highly social. If you ignore the social aspects and view them as only food motivated their behaviour doesn't make as much sense (as you pointed out).