The term 'homeless dog' can be summarized by the crossword solution 'STRAY'. A STRAY dog is a canine that has been separated from its owner or has been born in the wild. STRAY dogs are often homeless and lack proper care, nutrition, and shelter. They may also be exposed to diseases and other dangers. STRAY dogs are a common sight in many cities and towns, and they often rely on the kindness of strangers for food and shelter.