Jack Russell Terrier is a small, energetic and intelligent breed of dog originally bred in England for hunting small game such as foxes. They have a compact, muscular body and a short, smooth coat that can be white with black, tan or brown markings. Jack Russells are known for their high energy levels, playfulness, and affectionate nature towards their owners. They are also very intelligent and trainable, but can be stubborn at times. With proper socialization and training, Jack Russells can make great family pets for active households.