Are Jack Russells bigger than King Charles spaniel?

Jack Russells are generally similar in size to King Charles Spaniels, but they tend to be slightly taller and more muscular. Jack Russells typically weigh between 13-17 pounds and stand about 10-15 inches tall, while King Charles Spaniels usually weigh around 13-18 pounds and stand about 12-13 inches tall. Overall, the difference in size is minimal, but Jack Russells may be perceived as more robust.