Final answer:
A paraphrase for the original text on dog behavior based on size could articulate that smaller breeds behave more defensively as personal guardians whereas larger breeds guard a wider territory.
Step-by-step explanation:
An appropriate paraphrase of the original language might read: 'Compared to larger breeds, smaller canines tend to exhibit more defensive behavior, often considering themselves guardians of their human companions; conversely, large dogs typically view the broader territory they inhabit as their responsibility.' This rewording maintains the original meaning while using different language and structure, reflecting the thesis that dog behaviors vary with size and perceived roles within human environments.