Jack Russell Terriers are lively and intelligent dogs known for their energetic nature and playful demeanour. Typically, they stand about 10 to 15 inches tall (25 to 38 cm) at the shoulder, weighing between 13  and 17 pounds (6 to 8 kg). Their neck size generally ranges from 12 to 14 inches (30 to 36 cm). These small yet robust dogs are known for their loyalty and strong hunting instincts, making them excellent companions for active families. With their charming personalities and boundless enthusiasm Jack Russells thrive in environments where they can engage in plenty of exercise.