The Role of Large Pointy Ears in Dogs Large pointy ears, evolved specifically for living in hot, arid climates. The great surface area of the ears means that all the many tiny capillaries and blood vessels in the ears are close to the surface of the skin, providing an effective heat exchange surface to help keep the dog cool! The hair on the ears is also very fine and short, even compared to the short, fine fur these breeds have on the rest of their bodies! Ultimately, this provides protection from the sun without making the dog warm! In addition, the shape and structure of the ears form a kind of amplified speaker in the ear canal, giving this breed a very fine sense of hearing. The role of the dog’s large, hairy, droopy ears Fluffy, hairy ears, most spaniel breeds have large, floppy ears, like the long, tangled curls of the Cocker Spaniel. This type of ear structure reflects much of the history of the Cocker Spaniel as a working dog breed in England, including climate, geography and the type of activity the breed has had! Historically working Cocker Spaniels were used in the English countryside for hunting and retrieving, often through thick undergrowth and rugged terrain while hunting! The fact that the ears droop rather than stand upright helps protect the ear canal from debris such as seeds and burrs that might otherwise work their way inside the ears, while the thick, long hair on the outside of the ears helps protect the ear canal! Injuries from scratches, and rain in the channel! In addition, when dogs run, the ears flap behind them, providing a cooling effect to the wide surface area of the outer ear. The dog’s ear is the only organ that receives sound The dog’s ear is divided into the outer ear, middle ear and inner ear. The outer ear consists of the auricle, external auditory canal and tympanic membrane. The shape of a dog’s ear can vary depending on the breed, type and individual. Usually, the ears can be classified as erect, button, semi-erect, pendulous, rose and bat ears according to their size, shape and erectness (Figure 2-3). This is an important basis for identifying different breeds of dogs. The middle ear includes the tympanic chamber, the auditory tubercle and the eustachian tube; the inner ear can be divided into two parts: the bony vagus and the membrane vagus. The outer and middle ears are the parts that collect and conduct sound waves; the inner ear is the part of hearing and position sensation. In dogs, sound waves are collected by the auricle, vibrate the tympanic membrane, pass through the auditory tuberosity to the vestibular window, vibrate the ectolymph and endolymph, stimulate the receptors, and finally pass the impulses through the nerves to the brain to produce hearing. The canine ear easily collects sound, hears well, and the ear can move with the direction of the sound source. Its hearing is 300 to 500 of human, and the range of sound field activities is also very wide, and it can hear tiny sounds beyond 1000 meters, especially high wavelength sounds that cannot be heard by humans. Therefore, the dog can use this ability to show the location of the sound source for people with poor hearing, and can be used as a hearing guide dog.
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