Purity and purity of a beagle can be determined by the dog’s body proportions, head shape, pupil color, ear size, tail length, etc. Beagles are small and medium-sized dogs, about 13 to 15 inches, with an oval head, very large and long ears, generally no longer than the nose, black or brown pupils, and irregular yellow and black patches on the body. Beagles have a docile personality, are very smart, lively and active, so they are very suitable for family breeding.