The Jack Russell terrier was a small, energetic breed of dog, so named because it was originally bred by John "Jack" Russell for the purposes of fox hunting. It was primarily white with the occasional black or tan marks.
Behind the scenes
- J. K. Rowling chose the Jack Russell terrier as a sentimental choice for Ron's patronus, because she had a Jack Russell terrier, whom she stated to be "insane."
- Harry Potter and the Order of the Phoenix (Mentioned as "terrier")
- Harry Potter and the Order of the Phoenix (film) (Appears as a Patronus)
- Pottermore (Appears as a Patronus)