The crossword solution for the term HOT DOG, ONCE is LASSIE, which is a six letter word. LASSIE is a fictional character created by Eric Knight in a short story that was later adapted into a novel and then into a movie. The character is a female Rough Collie dog who is loyal and brave and often helps her human family out of difficult situations. LASSIE has been featured in numerous films, television shows, books, and other media.