We generally distinguish two types of food aggression in dogs: a genetic predisposition and a learned behavior. The former is more common and has to managed and the latter less common but can be resolved.
Leash aggression in dogs is one of those phrases we hear regularly. Most dog owners use this term if their dog loses their mind at other dogs, or people, or cars, or bikes, or whatever, when on a leash.
Much of what is called dog misbehavior is rooted in genetic frustration. Most dog misbehavior is not that but simply a normal—and perfectly fine—behavior expressed in an inappropriate context.
Every dog finds forced isolation unpleasant. No dog enjoys you going to work and leaving them alone for eight to ten hours a day. Dogs are social creatures. While dogs sleep a lot and do need their alone time, most of the time, they would rather be with you, than away...