There are more than 150 dog breeds, divided into 8 classes: sporting, hound, working, terrier, toy, non-sporting, herding, and miscellaneous.
Dogs can see in the dark because of the tapetum lucidum, a mirror-like membrane in dogs’ eyes. There are light-and-motion sensitive cells in the retina that are referred to as rods, which can tell the difference between light and shadow. The tapetum lucidum rebounds the light that the rods didn’t absorb into the retinas so they can take in more light. Dogs have evolved to be able to see better in dim light, yet they can’t do so as well as cats.
The reason dogs curl up is because of an age-old instinct to keep themselves warm and to protect vital organs while they sleep.
Although a dog only has 1,700 taste buds compared to the 9,000 a human has, some of them are sensitive to water. Since dogs are carnivores, it is thought their taste buds may have evolved in this way in order to maintain a balance of internal fluids after eating certain things, such as meat with high salt content. This is an ability that humans don’t possess
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