The modern breed is prone to several health problems, including cardiac conditions and a range of eye problems. Being a brachycephalic breed, King Charles Spaniels can be sensitive to anesthesia. This is because in brachycephalic dogs, there is additional tissue in the throat directly behind the mouth and nasal cavity, known as the pharynx, and anesthesia acts as a muscle relaxant causing this tissue to obstruct the dogs' narrow airways. This is because in brachycephalic dogs, there is additional tissue in the throat directly behind the mouth and nasal cavity, known as the pharynx, and anesthesia acts as a muscle relaxant causing this tissue to obstruct the dogs' narrow airways. These narrow airways can decrease the dogs' ability to exercise properly and increase their susceptibility to heat stroke. Other congenital and hereditary disorders found in the King Charles Spaniel are hanging tongue, where a neurological defect prevents the tongue from retracting into the mouth; diabetes mellitus, which may be associated with cataracts; cleft palate and umbilical hernia.
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