Parson Russell Terriers are from southern England. They originated in the mid-1800s, a time when terrier breeds were becoming popular among hunters and farmers. Their development is credited to John “Jack” Russell, an avid dog enthusiast who aimed to create a unique type of terrier. The breed’s ancestors include the old English Fox Terrier, known for their agility, and other local terriers that brought tenacity and a sturdy build to the breed.