Dogs were first domesticated by cavemen in the Palaeolithic age and gradually developed into the breeds known today. The lifespan of a dog, on an average is between 8 to 15 years. The sweat glands of a dog are located between their paw pads. Dogs are di-chromatic and have color vision equivalent to red-green color blindness in humans..he eyes of different breeds of dogs have different shapes, dimensions, and retina configurations.Experimentation has proven that dogs can distinguish between complex visual images such as that of a cube or a prism.
The frequency range of dog hearing is approximately 40 Hz to 60,000 Hz.dogs have ear mobility which allows them to rapidly pinpoint the exact location of a sound.
Dogs are also vulnerable to some of the same health conditions as humans, including diabetes, dental and heart disease, epilepsy, cancer, hypothyroidism, and arthritis.
Dogs are highly susceptible to theobromine poisoning, typically from ingestion of chocolate ,especially dark chocolate.
St. Bernard is a giant, strong, muscular dog. these dogs are very gentle and friendly. This breed has become famous because it has helped save lives in the Swiss Alps. A monastery located in the Alps of Switzerland along the Saint Bernard Pass. The pass was the most important crossing over the Alps and very often travelers were lost in the snow while crossing it. These dogs were trained to rescue the lost travelers.
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