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www.reference.com/article/dog-sleep-much-9230a50c12d997e

The age and type of dog helps determine the amount of sleep it needs, notes Dog'sHealth.com. Diseases and medical conditions are also sometimes a factor in a dog's sleep.

www.reference.com/article/dog-panting-much-4eccfc92bc5f3ebb

Dogs pant because of heat, nervousness or illness, according to petMD. As dogs cannot sweat through the skin like humans do, they circulate cool air through their bodies by panting. Many dogs pant when they get nervous or excited, such as when a thunderstorm is near. Pa...

www.reference.com/article/dogs-shed-much-7cf4f11f0520683a

Dogs naturally shed their hair, and the amount they shed has to do with their overall health, breed and the time of year. If a dog is shedding excessively, it may be a sign of poor nutrition, stress or a medical condition.

www.reference.com/article/dogs-loyal-e635e260f20fde87

Dogs are loyal because they have evolved from life as pack animals, so they have a strong urge to protect and serve the alpha in the pack, which has become their human owner or family, according to Dr. Zawistowski, an ASPCA science advisor. Some people believe that dogs...

www.reference.com/article/dog-thirsty-44e5f9393b630c87

Dogs can exhibit signs of excessive water drinking for a variety of reasons, including life-threatening dehydration, illness, side effects to medication, diet and physical activity, according to WebMD. If a dog is dehydrated, it may also have a dry tongue and gums, be l...

www.reference.com/article/dog-salivating-much-44b1f32f332aa465

According to petMD, excessive salivation in dogs can come from ptyalism or pseudoptyalism, two similar conditions with very different causes. Ptyalism is merely the excessive flow of saliva, while pseudoptyalism is the spillage of saliva trapped in the mouth.

www.reference.com/article/people-mean-c0e087537d54917

In the realm of psychology, there are four primary reasons why a social creature such as a human exhibits unsociable, or mean, behavior: positive distinction, downward comparisons, classical projection and ego threat. When someone criticizes or threatens another, it's a...