Beagles are small to medium size, muscular dogs. Their height can go up to 15 inches and weigh up to 22 pounds. These are the bigger brothers. The smaller ones can attain a height of between 13 and 15 inches and weigh between 18 to 20 pounds. This is the original beagle’s pack. There are beagle mixes that have different sizes. This will enable you to choose the right size you want for a pet.