What breed of dog was scruffy in the ghost and mrs Muir?

In the Classic Television series "The Ghost and Mrs. Muir," the character Scruffy was portrayed as a mixed-breed dog, often referred to as a terrier. His scruffy appearance and playful demeanor added charm to the show, complementing the whimsical interactions between Mrs. Muir and the ghost of Captain Daniel Gregg. Scruffy became a beloved companion and a memorable part of the series.